Question

The correct order of decreasing bond angles is

• A. $NH _{3}> NH _{2}^-> \overset{+}{N}H _{4}$
• B. $\overset{+}{N}H _{4}> NH _{3}> NH _{2}^-$
• C. $NH _{2}^{-}> NH _{3}> NH _{4}^{+}$
• D. $NH _{4}^{+}> NH _{2}^ - > NH _{3}$

Answer 1

Answer: (B)

As the number of lone pair of electrons of $N$ increases, bond angle decreases. $NH _{4}^{+}, NH _{3}$ and $NH _{2}^{-}$ contain $0,1,$ and 2 lone pairs respectively.