A) \[{{(C{{H}_{3}})}_{2}}\]
B) \[{{(Si{{H}_{3}})}_{2}}\]
C) \[{{(B{{H}_{3}})}_{2}}\]
D) \[P{{H}_{3}}\]
Correct Answer: C
Solution :
Boron is an element of 13 group and contains three electrons in its valence shell. When its compound \[B{{H}_{3}}\]dime rises, each boron atom carry only \[6{{e}^{-}},\] that is their octet is incomplete. Hence, \[{{(B{{H}_{3}})}_{2}}\] is an electron deficient compound. In all other given molecules octet of central atom is complete.
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