Rank the following four isomeric hydrocarbons in order of...

Rank the following four isomeric hydrocarbons in order of increasing stability: cis-1,4-Dimethylcyclohexane 1-Cyclopropylpentane Ethylcyclohexane cis-1-Ethyl-2-propylcyclopropane QUESTION 13 Which are the hybridization states of C1, C2, and C3 in the following molecule? O || HO-C-CH=C=CH2 ? ? ? C1 C2 C3 C1 is: C2 is: C3 is: a. sp2 b. sp c. sp2

Transcript

00:01 Hi, in this question we are having two parts.

00:02 In the first part of the question we are given with these four isomeric hydrocarbons and we are asked to arrange them in increasing order of their stability.

00:11 The first compound we are having is cis -1 ,4 -dimethylcyclohexane.

00:17 This is the chair form of the cis -1 ,4 -dimethylcyclohexane.

00:22 The second compound is 1 -cyclopropylpentane.

00:27 This is the structure.

00:28 The third compound is ethylcyclohexane and the fourth compound is cis -1 -ethyl -2 -propylcyclopropane.

00:37 Here we can say that the stability of the six -membered ring is greater than three -membered ring because in three -membered ring there is strain.

00:54 Now in six -membered ring when it present in chair form then we can say that there is presence of 1 ,3 -diaxial interaction.

01:04 That is this is the first carbon and this is third carbon.

01:08 Here we are having ch3 and this hydrogen of ch3 interacts with this hydrogen that is present at the third position and this will create the steric hindrance.

01:21 Here also we have hydrogen and here we have ch3.

01:25 Then due to 1 ,3 -diaxial interaction we can see there is steric hindrance hence we can say that the stability is decreases in this case.

01:44 Now if we see the third compound which is also in the chair form here we have ethylcyclohexane.

01:51 This ethyl group is present on the equatorial position hence we can say that there is no 1 ,3 -diaxial interaction.

02:02 Therefore we can say that the stability of this compound is greater than the first one.

02:09 Now we have to decide between second and third.

02:13 Here we are having a three -membered ring which is attached on the pentane chain and in the fourth compound we are having a three -membered ring on which two groups are present as a substituent in the cis position...

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