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Addition Reactions

Substance A...

Question

Substance $A, C_{5} H_{8}$ is chiral When $A$ is treated with $H_{2} / P t B, C_{5} H_{10},$ is produced $B$ is achiral $A$ can be:

A

1- methylcyclobutene

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B

3-methylcyclobutene

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C

trans-1,2-dimethylcyclopropane

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D

cyclopentane

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Solution

The correct option is B 3-methylcyclobutene

(A) 1- methylcyclobutene is not chiral so it cannot be substance A
(B) 3-methylcyclobutene is chiral and the product obtained after reaction with $H_{2} / P t$ is achiral
(C) trans-1,2-dimethylcyclopropane is an alkane so $H_{2} / P t$ cannot react with it
(D) Cyclopentane is also an alkane as well as not a chiral compound

Thus, the correct representation of compound (A) is option (B)

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