NEET2013Chemistryp Block Elements (Group 13 & 14)Actual

Which of the following is electron deficient?

Options

A( CH ₃ ₂
B( SiH ₃ )₂
CBH ₃
DPH ₃

Correct answer

C. BH ₃

Step-by-step solution

Boron is an element of 13 group and contains three electrons in its valence shell. When its compound BH ₃ dimerises, each boron atom carry only 6 e⁻ , that is their octet is incomplete. Hence, ( BH ₃ )₂ is an electron deficient compound. In all other given molecules octet of central atom is complete.

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