Section 1
Level I
How many stereocenters does latomoxef (an oxacephem antibiotic) have?(a) 2(b) 3(c) 4(d) 5
Which molecule is $(\mathrm{R}, \mathrm{Z})-7$ -methoxy $-2,7$ -dimethyl- 4 -propylnona- 1,4 -diene?
Choose the correct order that has the following compounds correctly arranged with respect tothermodynamic stability.(a) $\mathrm{ii}<\mathrm{i}<\mathrm{iii}$(b) $\mathrm{i}<\mathrm{ii}<\mathrm{ii}$(c) $\mathrm{i}<\mathrm{iii}<\mathrm{i}$(d) $\mathrm{iii}<\mathrm{i}<\mathrm{ii}$
Which of the structures below is a diastereomer of $\mathrm{A}$ ?(a) i(b) iii(c) ii and iv(d) iv
The total number of structural isomers of $\mathrm{C}_{4} \mathrm{H}_{11} \mathrm{~N}$ would be(a) 4(b) 8(c) 5(d) 10
Which of the following pair is the chain isomer?
How many geminal dichloride with different formula are possible for $\mathrm{C}_{3} \mathrm{H}_{6} \mathrm{Cl}_{2}$ ?(a) only one(b) two(c) three(d) four
What is the relation between 3-ethylpentane and 3-methylhexane?(a) Chain isomers(b) Position isomers(c) Functional isomers(d) Metamers
How many isomers are possible for methyl anthracene?(a) 2(b) 3(c) 4(d) 5
The compounds $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N}$ and $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}$ represent(a) chain isomerism(b) position isomerism(c) functional isomerism(d) all of the above
An isomer of ethanol is(a) methanol(b) acetone(c) diethyl ether(d) dimethyl ether
The number of primary, secondary and tertiary amines possible with the molecular formula $\mathrm{C}_{3} \mathrm{H}_{9} \mathrm{~N}$ respectively(a) $1,2,2$(b) $1,2,1$(c) $2,1,1$(d) $3,0,1$
Examine the relation between the following pairs of compounds(a) All i, ii, iii are identical(b) All i, ii, iii are isomers(c) i, ii are identical, iii is isomer(d) i is identical and ii, iii are isomers
(a) Positional(b) Chain(c) Geometrical(d) Functional
Given compound shows which type of isomerism?(a) Chain isomerism(b) Positional isomerism(c) Metamerism(d) Functional group isomerism
Functional isomersMetamersMetamersFunctional isomers(a) TFTF(b) FTTF(c) TTFT(d) TFFT
Which compound is not the isomer of 3 -ethyl-2-methylpentane?
Which of the following is not the correct relationship?(a) ii and iv are metamers(b) $\mathrm{i}$ and $\mathrm{ii}$ are functional isomers(c) $\mathrm{i}$ and iii are chain isomers(d) $\mathrm{i}$ and iv are positional isomers
What is the correct relationship between the following compounds?(a) Chain isomers(b) Position isomers(c) Functional isomers(d) Identical
Which one of the compound is not isomer of others?
Which type of isomerism is observed between $\mathrm{i}$ and ii?(a) Chain isomers(b) Position isomers(c) Functional isomers(d) Metamers
The correct relationship among the following pairs of given compounds is(a) Chain isomer(b) Positional isomer(c) Metamer(d) Functional isomer
Which of the following is a pair of metamers?
Which of the following can show tautomerism?
Which of the following can show tautomerism?(a) $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CNO}$(b) $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}$(c) $\mathrm{R}_{3} \mathrm{CNO}_{2}$(d) $\mathrm{RCH}_{2} \mathrm{NO}_{2}$
Which will not show tautomerism?
Which will not show tautomerism?(a) $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{NO}_{2}$(b) $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}-\mathrm{CH}_{2} \mathrm{NO}_{2}$(c)(d) $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}-\mathrm{NO}_{2}$
Which of the following compound show tautomerism?(a) $\left(\mathrm{H}_{3} \mathrm{C}\right)_{2} \mathrm{CCl}-\mathrm{CH}=\mathrm{CH}_{2}$(b)<smiles>O=Cc1ccccc1</smiles>(c) $\left(\mathrm{H}_{3} \mathrm{C}\right)_{2} \mathrm{C}\left(\mathrm{NO}_{2}\right)-\mathrm{CH}=\mathrm{CH}-\mathrm{CHO}$(d) None of these
Which of the following will not show tautomerism?
Tautomerism will be exhibited by(a) $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}$(b) $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CNO}$(c) $\mathrm{R}_{3} \mathrm{CNO}_{2}$(d) $\mathrm{RCH}_{2} \mathrm{NO}_{2}$
Which of the following is not an example of tautomeric equilibrium?(a) $\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{C}=\mathrm{O} \rightleftharpoons \mathrm{CH}_{2}-\mathrm{CH}=\mathrm{C}-\mathrm{O}$(b) $-\mathrm{N}=\mathrm{N}-\mathrm{NH} \rightleftharpoons \mathrm{NH}-\mathrm{N}=\mathrm{N}$(c) $>\mathrm{CH}-\mathrm{N}=\mathrm{O} \rightleftharpoons>\mathrm{C}=\mathrm{N}-\mathrm{OH}$(d) $-\mathrm{NH}-\mathrm{C}=\mathrm{O} \rightleftharpoons-\mathrm{N}=\mathrm{C}-\mathrm{OH}$
Among these compounds, which of following is the correct order of $\%$ enol content?(a) $\mathrm{i}>\mathrm{ii}>\mathrm{iii}$(b) $\mathrm{iii}>\mathrm{ii}>\mathrm{i}$(c) $\mathrm{ii}>\mathrm{iii}>\mathrm{i}$(d) $\mathrm{i}>\mathrm{iii}>\mathrm{ii}$
Which of the following will have highest percentage of enol content?
Which of the following compounds have less enol content?(a) i(b) ii(c) Both (a) and (b)(d) None of these
Which of the following compounds have higher enol content?(a) i(b) ii(c) $\mathrm{i}=\mathrm{ii}$(d) None of these
Geometrical isomers differ in(a) position of functional group(b) spatial arrangement of atoms(c) position of atoms(d) length of carbon chain
Stereoisomers have different(a) Molecular formula(b) Structural formula(c) Configuration(d) Molecular mass
Which of the following compounds has restricted rotation?
Which of the following compounds does not have restricted rotation?
Which compound can show geometrical isomerism?(a) $\mathrm{CH}_{3} \mathrm{CH}=\mathrm{C}\left(\mathrm{CH}_{3}\right)_{2}$(b) $\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CH}_{2}$(c) $\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CHCH}_{3}$(d) $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{C}=\mathrm{C}\left(\mathrm{CH}_{3}\right)_{2}$
Which of the following will not show cis-trans isomerism?
Geometrical isomerism is shown by
The “E”-isomer is
The compounds X and Y shown in the below reaction can be
The “Z”-isomer is
Which of the following compounds cannot show geometrical isomerism?
The total number of geometrical isomers possible in following compound is(a) 2(b) 1(c) 6(d) 8
The total number of geometrical isomers possible in following compound is(a) 4(b) 6(c) 3(d) 2
The number of geometrical isomers in the following compound is$\mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}-\mathrm{C}_{2} \mathrm{H}_{5}$(a) 4(b) 3(c) 2(d) 5
The number of cis-trans isomer possible for the following compound is(a) 2(b) 4(c) 6(d) 8
What characteristic is the best common to both cis-2-butene and trans-2-butene?(a) B.P.(b) Dipole moment(c) Heat of hydrogenation(d) Product of hydrogenation
Number of chiral carbon atoms in the compound x, y and z respectively would be(a) $0,2,1$(b) $1,0,1$(c) $1,2,1$(d) $1,2,0$
Number of chiral carbon persent in the following compound is(a) 2(b) 3(c) 4(d) 5
Which of the following have asymmetric carbon atom?
Meso-tartaric acid and d-tartaric acid are(a) positional isomers(b) enantiomers(c) diastereomers(d) racemic mixture
The number of optically active compounds in the isomers of $\mathrm{C}_{4} \mathrm{H}_{9} \mathrm{Br}$ is(a) 1(b) 2(c) 3(d) 4
Which of the following compound has “S” configuration?
The number of optically active isomers observed in 2,3 -dichlorobutane is(a) 0(b) 2(c) 3(d) 4
The correct configuration assigned for compound (i) and (ii) respectively is(a) $\mathrm{R}, \mathrm{R}$(b) $\mathrm{S}, \mathrm{S}$(c) $\mathrm{S}, \mathrm{R}$(d) $\mathrm{R}, \mathrm{S}$
The R/S configurations of these compounds are respectively(a) $\mathrm{R}, \mathrm{R}, \mathrm{R}$(b) $\mathrm{R}, \mathrm{S}, \mathrm{R}$(c) $\mathrm{R}, \mathrm{S}, \mathrm{S}$(d) $\mathrm{S}, \mathrm{S}, \mathrm{S}$
Which of the following compound has plane of symmetry (POS) but not centre of symmetry $(\mathrm{COS}) ?$
The instrument which can be used to measure optical activity, i.e., specific rotation(a) Refractometer(b) Photometer(c) Voltmeter(d) Polarimeter
The two compounds given below are(a) Enantiomer(b) Identical(c) Meso compound(d) Diastereomers
Which of the following compounds do not possess a $C_{2}$ axis of symmetry?
observe the following structures (i) to (iii)Correct statement is(a) All three are chiral compounds(b) $\mathrm{i}$ and $\mathrm{ii}$ are chiral(c) Only ii is chiral(d) Only iii is chiral
How many stereoisomers can exist for the following acid?(a) Two(b) Four(c) Eight(d) Sixteen
Total number of stereoisomers in the above compound is(a) 6(b) 4(c) 8(d) 16
Total number of stereoisomers of the compound is given below
Total number of stereoisomers of the compound is given below(a) 2(b) 4(c) 6(d) 8
How many stereoisomers of the following molecule are possible?$$\mathrm{HOOC.CH}=\mathrm{C}=\mathrm{CH} \cdot \mathrm{COOH}$$(a) two optical isomers(b) two geometrical isomers(c) two optical and two geometrical isomers(d) none
Total number of stereoisomer of compound is given below(a) 2(b) 4(c) 6(d) 8
The enantiomeric excess and observed specific rotation of a mixture containing $6 \mathrm{~g}$ of $(+)-2$ -butanol and $4(\mathrm{~g})$ of $(-)-2$ -butanol are respectively (If the specific rotation of enantiomerically pure $(+)-2$ -butanol is $+13.5$ units)(a) $80 \%$, $+2.7$ unit(b) $20 \%,-27$ unit(c) $20 \%,+2.7$ unit(d) $80 \%$, $-27$ unit
Which of the following pair of isomers cannot be separated by fractional crystallisation or fractional distillation?(a) Maleic acid and fumaric acid(b) (+)-Tartaric acid and meso-tartaric acid (c) $\mathrm{CH}_{3}-\mathrm{CH}-\mathrm{COOH}$ and $\mathrm{H}_{2} \mathrm{~N}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{COOH}$<smiles>CC(N)C(=O)O</smiles>(d) ( $+$ )-lactic acid and (-)-lactic acid
Increasing order of stability among the three main conformation (i.e., eclipse, anti, gauche) of ethylene glycol is(a) Eclipse, gauche, anti(b) Gauche, eclipse, anti(c) Eclipse, anti, gauche(d) Anti, gauche, eclipse
Which of the following pairs of compound is/are identical?
The two structures (i) and (ii) represent(a) Conformational isomers(b) Stereoisomers(c) Constitutional isomers(d) Identical
In which of the following has minimum torsional strain and minimum Vander waal strain?(a) i(b) ii(c) iii(d) iv
In the Newman projection formula of the least stable staggered form of $\mathrm{n}$ -butane, which of the following reasons is the causes of its unstability?(a) Van der Waal's strain(b) Torsional strain(c) Combination of both(d) None of these
Which of the following represent the staggered conformation with dihedral angle $\phi=60$ ?
The dihedral angle between two methyl groups in partially eclipsed conformation of n-butane is(a) $180^{\circ}$(b) $120^{\circ}$(c) $90^{\circ}$(d) $109^{\circ} 28^{\prime}$
Which of the following is an achiral molecule?
Which of the following is most stable?
Evaporation of an aqueous solution of ammonium cyanate gives urea. This reaction follows the class of(a) Polymerisation(b) Isomerisation(c) Association(d) Dissociation
The possible number of alkynes with the formula $\mathrm{C}_{5} \mathrm{H}_{8}$ is(a) 2(b) 3(c) 4(d) 5
How many isomers of $\mathrm{C}_{5} \mathrm{H}_{11} \mathrm{OH}$ will be primary alcohols(a) 2(b) 3(c) 4(d) 5
Number of isomeric forms of $\mathrm{C}_{7} \mathrm{H}_{9} \mathrm{~N}$ having benzene ring will be(a) 7(b) 6(c) 5(d) 4
Which of the following is an isomer of diethyl ether(a) $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH}$(b) $\mathrm{CH}_{3} \mathrm{CHO}$(c) $\mathrm{C}_{3} \mathrm{H}_{7} \mathrm{OH}$(d) $\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{2} \mathrm{CHOH}$
Total number of isomeric alcohols with the formula $\mathrm{C}_{4} \mathrm{H}_{10} \mathrm{O}$ is(a) 1(b) 2(c) 3(d) 4
The molecular formula of a saturated compound is $\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{Cl}_{2}$. The formula permits the existence of two(a) functional isomers(b) position isomers(c) optical isomers(d) cis-trans isomers
The type of isomerism found in urea molecule is(a) Chain(b) Position(c) Tautomerism(d) None of these
An alkane can show structural isomerism if it has ......... number of minimum carbon atoms(a) 1(b) 2(c) 3(d) 4
How many chain isomers can be obtained from the alkane $\mathrm{C}_{6} \mathrm{H}_{14} ?$(a) 4(b) 5(c) 6(d) 7
Keto-enol tautomerism is observed in
The number of geometrical isomers in case of a compound with the structure$\mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}-\mathrm{C}_{2} \mathrm{H}_{5}$ is(a) 4(b) 3(c) 2(d) 5
Which one of the following will show geometrical isomerism?
In the reaction: $\mathrm{CH}_{3} \mathrm{CHO}+\mathrm{HCN} \longrightarrow \mathrm{CH}_{3} \mathrm{CH}(\mathrm{OH}) \mathrm{CN}$a chiral centre is produced. The number of stereoisomers of the product is(a) 3(b) 2(c) 4(d) none of these
The molecule 3 -penten-2-ol can exhibit(a) Optical isomerism(b) Geometrical isomerism(c) Metamerism(d) TautomerismThe correct answer is(a) (a) and (b)(b) (a) and (c)(c) (b) and (c)(d) (a) and (d)
Find the total number of isomers (including stereo isomers) in dimethyl cyclopropane and dimethyl cyclobutane(a) 6,8(b) 5,6(c) 4,5(d) 4,6
(a) plane of symmetry(b) centre of symmetry(c) $C_{3}$ axis of symmetry(d) $C_{4}$ axis of symmetry
How many optically active cycloalkanones are possible with the molecular formula $\mathrm{C}_{5} \mathrm{H}_{8} \mathrm{O} ?$(a) 8(b) 6(c) 5(d) 4
(a) Geometrical isomers(b) Position isomers(c) Chain isomers(d) Enantiomers
For the given compound which of the following statement(s) are correct?(a) It has 4 stereoisomers(b) It has 3 stereoisomers(c) It has 2 chiral centres(d) The compound does not show G.I.
Racemic mixture is formed by mixing two(a) Isomeric compounds(b) Chiral compounds(c) Meso compounds(d) Enantiomers
Which of the following does not show geometrical isomerism?(a) 1,2 -dichloro-1-pentene(b) 1,3 -dichloro-2-pentene(c) 1,1-dichloro-1-pentene(d) 1,4 -dichloro-2-pentene
The general formula $\mathrm{C}_{\mathrm{n}} \mathrm{H}_{2 \mathrm{n}} \mathrm{O}_{2}$ could be for open chain(a) Diketones(b) Carboxylic acids(c) Diols(d) Dialdehydes
Among the following four structures i to ivit is true that(a) All four are chiral compounds(b) Only $\mathrm{i}$ and ii are chiral compounds(c) Only iii is a chiral compound(d) Only ii and iv are chiral compounds
Amongst the following compounds, the optically active alkane having lowest molecular mass is
Which of the following compounds is not chiral?(a) 1-chloropentane(b) 2 -chloropentane(c) 1-chloro-2-methylpentane(d) 3-chloro-2-methylpentane
Which of the following molecules is expected to rotate the plane of polarised light?
The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is(a) $-\mathrm{SO}_{3} \mathrm{H},-\mathrm{COOH},-\mathrm{CONH}_{2^{\prime}}-\mathrm{CHO}$(b) $-\mathrm{CHO},-\mathrm{COOH},-\mathrm{SO}_{3} \mathrm{H},-\mathrm{CONH}_{2}$(c) $-\mathrm{CONH}_{2^{\prime}}-\mathrm{CHO},-\mathrm{SO}_{3} \mathrm{H},-\mathrm{COOH}$(d) $-\mathrm{COOH},-\mathrm{SO}_{3} \mathrm{H},-\mathrm{CONH}_{2^{\prime}}-\mathrm{CHO}$
The absolute configuration of(a) $\mathrm{R}, \mathrm{R}$(b) $\mathrm{R}, \mathrm{S}$(c) $\mathrm{S}, \mathrm{R}$(d) $\mathrm{S}, \mathrm{S}$
The alkene that exhibits geometrical isomerism is(a) 2 -methyl propene(b) 2-butene(c) 2-methyl-2-butene(d) propene
The number of stereoisomers possible for a compound of the molecular formula $\mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}(\mathrm{OH})-\mathrm{Me}$ is(a) 2(b) 4(c) 6(d) 3
Out of the following, the alkene that exhibits optical isomerism is(a) 3-methyl-2pentene(b) 4 -methyl-1-pentene(c) 3-methyl-1-pentene(d) 2-methyl-2-pentene
Identify the compound that exhibits tautomerism(a) 2 -butene(b) Lactic acid(c) 2-pentanone(d) Phenol