Q5 / 155 · WBJEE 2019 · Chemistry

The indicated atom is not a nucleophilic site in

  • Correct answer
    A
    $\mathrm{BH}_{4}^{-}$ (atom = B)
  • B
    $\mathrm{CH}_{3} \mathrm{Mg}$ (atom = C)
  • C
    $\mathrm{CH}_{3} \mathrm{OH}$ (atom = O)
  • D
    $\mathrm{CH}_{3} \mathrm{NH}_{2}$ (atom = N)

Solution

In BH ${ }_{4}^{-}$ indicated atom is not a nucleophilic site because there is no lone-pair on $\mathrm{B}^{\prime}$ atom. Hence, the option (a) is correct answer.

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

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