Identify chiral and achiral molecules in each of the following pairs compounds.

Explanation

(A) In structure (i), the central carbon atom is attached to four different substsituents i.e., `CH_(3),Br,OH` and H and hence (i0 is a chiral molecule. Since structure (ii) has two identical Br atoms, therefore, it represents an achiral molecule.
(B) In structure (i), the second carbon atom from left is attached to four different groups, i.e., `CH_(3),OH,H and CH_(2)CH_(2)CH_(3)` and hence (i) is a chiral molecule. since structure (ii) has two identical groups i.e., `CH_(3)CH_(2)` on either side of the central carbon atom, therefore, it represents an achiral molecule. (C) in structure (i), the second carbon atom from left is attached to four different groups, i.e., `CH_(3),H,Br and CH_(3)CH_(3)`, therefore, structure (i) represents a chiral molecule. since structure (ii) does not contain an asymmetric carbon, therefore, it represents an achiral molecule.