Question

In which of the following species the interatomic bond angle is ${109}^o{28}^{\prime }$ ?

• A. $N{H}_3,(B{F}_4{)}^{-1}$
• B. $(N{H}_4{)}^{+},B{F}_3$
• C. $N{H}_3,B{F}_3$
• D. $(N{H}_2{)}^{-1},B{F}_3$

Answer 1

The correct option is A $N{H}_3,(B{F}_4{)}^{-1}$

Both ${NH}_3$ and ${\left({BF}_4\right)}^{-1}$ have same hybridisation, ${sp}^3$, we know in ${NH}_3$, there is a lone pair, which makes the bond angle $109°{28}^{\prime }$.

${\left({BF}_4\right)}^{-1}$ and ${NH}_3$ has pyramidal structure. So they have same bond angle.