Question
Which of the following is electron deficient
-
(CH3)2
-
(SiH3)2
-
(BH3)2
-
PH3
Solution
C.
(BH3)2
Boron is an element of 13 group and contains three electrons in its valence shell. When its compound BH3 dimerises, each boron atom carry only 6e-, that is their octet is incomplete. Hence (BH3)2 is a deficient compound.
In all other given molecules octet of central atoms is complete.
