Chemistry - STEREO ISOMERISM Question with Solution | TestHub
Match the following :
Column I (Compound) | Column II (Number of stereocenter) |
|---|---|
(A) | (P) 4 |
(B) | (Q) 1 |
(C) | (R) 3 |
(D) | (S) Shows G.I. |
Options:
Answer:
Solution:
Ans. A S; B P, S; C S; D R, S.
Sol. A (2-methylcyclohexan-1-ol): C-1 (OH) and C-2 (CH3) are stereocentres (2 centres - not listed) and the molecule exists as cis/trans pairs, so it shows geometrical isomerism : S.
B (2,3,5-trimethyl-4-ethylcyclohexan-1-one): the four substituted ring carbons (C-2, C-3, C-4, C-5) each carry H plus four different groups : 4 stereocentres, and it shows geometrical isomerism : P, S.
C (1,3-dimethylcyclohexane): C-1 and C-3 are stereocentres (2 centres - not listed); cis/trans forms exist : S.
D (2,4,5-trimethyltetrahydrofuran): C-2, C-4 and C-5 each carry four different groups : 3 stereocentres, and cis/trans (geometrical) isomerism is shown : R, S.
