Q.

The isomeric deuterated bromide with molecular formula C4H8DBr having two chiral carbon atoms is           [2023]

1 2-Bromo-1-deuterobutane  
2 2-Bromo-2-deuterobutane  
3 2-Bromo-3-deuterobutane  
4 2-Bromo-1-deutero-2-methylpropane  

Ans.

(3)