Question

Correct order of bond angles for the following is

• A. $NH_3 > PCl_3 > BCl_3$
• B. $BCl_3 > NH_3 > PCl_3$
• C. $BCl_3 > PCl_3 > NH_3$
• D. $PCl_3 > BCl_3 >NH_3$

Answer 1

Answer: (B)

$BCl_3 > NH_3 > PCl_3$

Answer 2

BCI$_3$ is trigonal in shape where bond angle is 120$^{\circ}$. In NH$_3$ and PCI$_3$ (both are having pyramidal geometry), though the central atom has equal number of Ione pairs \and bond pairs, the valence shell of P is relatively bigger and pond angle is Iower.