Q62 / 180 · NEET 2013 (All India) · Chemistry

Which of the following is electron deficient?

  • A
    $\left(\mathrm{CH}_3\right\}_2$
  • B
    $\left(\mathrm{SiH}_3\right)_2$
  • Correct answer
    C
    $\left\langle\mathrm{BH}_3\right\rangle$
  • D
    $\mathrm{PH}_3$

Solution

Boron is an element of 13 group and contains three electrons in its valence shell. When its compound $\mathrm{BH}_3$ dimerises, each boron atom carry only $6 e^{-}$, that is their octet is incomplete. Hence, $\left(\mathrm{BH}_3\right)_2$ is an electron deficient compound. In all other given molecules octet of central atom is complete.

Hence, the correct answer is option: 'C'.

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