Match the Column (I) and (II)

Answer

a- q; b-p; c-r; d-s

Explanation

(a) Total No. of stereoisomers `=2^(n)`, When molecule is unsymmetrical.
(b) When molecule is symmetrical, total no. of stereoisomers
(I) When n= even Total isomers `=2^(n-1)+2^(n//2-1)`
(II) When n = odd.
Total isomers `=underset("Optically active ")((2^(n-1)-2^((n-1)/2))+underset("meso")2^((n-1)/2))`