Chemistry - STEREO ISOMERISM Question with Solution | TestHub
List - I (Compounds) | List - II (Statements) |
|---|---|
(P)
| (1) Total number of stereoisomers are 5 |
(Q)
| (2) Total number of stereoisomers are 2 |
(R)
| (3) Total number of stereoisomers are 3 |
(S)
| (4) Total number of stereoisomers are 10 |
| (5) All stereoisomers are diastereomers. |
Options:
Answer:
Solution:
(P) (4): The molecule is 1,2-dicarboxylic-3,4-diphenylcyclobutane, which possesses 4 chiral centers and lacks a vertical plane of symmetry, resulting in 10 stereoisomers (6 optically active enantiomeric pairs + 4 meso forms).
(Q) (3): This symmetric cyclic anhydride has a plane of symmetry passing through the central oxygen and carbonyl carbons, yielding exactly 3 stereoisomers (one meso form and one pair of enantiomers).
(R) (1, 5): 1,3-dicarboxylic-2,4-diphenylcyclobutane has a completely symmetric distribution of substituents around the ring, meaning all its 5 stereoisomers possess planes of symmetry, making them meso structures (diastereomers to one another).
(S) (2): This rigid spirocyclic compound contains rigid perpendicular rings that give rise to geometric cis/trans isomers, producing a total of 2 stereoisomers.
