Question

Which of the following molecules does not show stereo isomerism?

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• A. 3, 4-Dimethylhex-3-ene
• B. 4-Methylhex-1-ene
• C. 3-Methylhex-1-ene
• D. 3-Ethylhex-3-ene

Answer 1

The correct option is D 3-Ethylhex-3-ene

Geometrical and optical isomerism are stereoisomersm.
Compound (c) does not show geometrical isomerism because same group is attached to the one of the $s{p}^2$ doule bonded carbon.
It also lack optical isomerism due to absence of chiral carbon or chiral plane.

Compound (a) - It shows geometrical isomerism.


Compound (b) - It lacks geometrical isomerism but shows optical isomerism due to the presence of chiral carbon.

Compound (d) - It lacks geometrical isomerism but shows optical isomerism due to the presence of chiral carbon.

Hence, option (c) is correct.