Question

If the stereochemistry about the double bond in `(A)` is `cis-`, the total number of stereoisomers for `(A)` is `:`
A. `2,` pair of enantiomers.
B. 3, one pair of enentiomers and one meso form `(` optically inactive due to the presence of centre of symmetry `)`.
C. 3, one pair of enenctiomers and one meso form `(` optically inactive due to the presence of plane of symmetry `)`.
D. 2, both optically inactive due to the presence of both centre and plane of symmetry.

Answer 1

Correct Answer - c
If compound `(a)` is `cis,` we get diastereomers, `(III)` and `(VI), (III)`is meso `(O.I.A.)` due to plane of symmetry. `(IV)` is `O.A.(` two enantiomers `).` Total stereoisomers when `(A)` is `cis =3`