Question

Which among the following is an electron deficient compound?

• A. $NH_3$
• B. $PH_3$
• C. $BH_3$
• D. $AsH_3$

Answer 1

Answer: (C)

$BH_3$

Answer 2

$BH_{3}$ has $6$ electrons in the valence shell of $B$-atom. As it has incomplete octet, so this is an electron deficient molecule