Question

Between any two of the following molecules, hydrogen bonding is not possible:

• A. two primary amine molecules
• B. two secondary amine molecules
• C. two tertiary amine molecules
• D. two ammonia molecules

Answer 1

The correct option is C two tertiary amine molecules

Between two tertiary amine molecules, hydrogen bonding is not possible.
The hydrogen bonding is possible when $H$ atom is attached to electronegative $N,O$ or $F$ atom. In tertiary amines, no $H$ atom is attached to $N$ atom. Hence, hydrogen bonding is not possible.