A compound having a carbon atom attached to -H, -OH, -COOH, -OCOC2H5 groups. How many chiral carbons are in this compound?
a. 1
b. 2
c. 3
d. 4
Question 2
Rank the following sets of substituents in order of priority (highest on the left) according to the Cahn-Ingold-Prelog sequence rules.
a. 3 > 4 > 1 > 2
b. 2 > 4 > 1 > 3
c. 2 > 4 > 3 > 1
d. 4 > 2 > 1 > 3
Question 3
The IUPAC name of the below compound is
a. 2-methyl-3-oxohex-4-enal.
b. 3-oxo-2-methylhex-5-enal.
c. 5-formylhex-2-en-3-one.
d. 5-methyl-4-oxohex-2-en-5-al.
Question 4
Lactic acid in which the methyl group, hydroxyl group, a carboxylic acid, and a hydrogen atom are attached to a central atom shows optical isomerism due to molecular geometry at the
a. Oxygen of the hydroxyl group.
b. Carbon atom of the carboxylic acid group.
c. Carbon atom at the methyl group.
d. Central carbon atom
Question 5
Choose "A" and "B" for the below reaction.
a. 2,3,3-trimethylpropanal and 2,3,3-trimethylbutanoic acid.
b. 2,3,3-trimethylpentanal and 2,3,3-trimethylpentanoic acid.
c. 2,3,3-trimethylbutanal and 2,3,3-trimethylbutanoic acid.
d. 2,3,3-trimethylbutanal and 2,3,3-trimethylpentanoic acid.
Question 6
Which of the following statements is not true for the biochemical method of resolution?
a. One of the enantiomers is always destroyed.
b. It is difficult to find specific microorganisms for racemic modification.
c. It is one of the best methods, and we can get both enantiomers of a racemic mixture.
d. Bacteria and molds are allowed to grow in a solution of a racemic modification.
Question 7
Select a suitable reagent for the following reaction.
a. P2S3
b. P2O5
c. P2O3
d. P2S5
Question 8
Which is the structure of R-limonene present in orange fruit?
a.
b.
c.
d.
Question 9
Complete the following reaction.
a. CH3(CH2)4CH2CH2SH.
b. CH3(CH2)4SH.
c. CH3(CH2)3SH
d. CH3(CH2)4CH2SH.
Question 10
Which of the following tautomeric forms is more stable?
a. II.
b. Both are unstable.
c. Both are equally stable.
d. I