Which of the following molecules acts as a Lewis acid ?

Which of the following molecules acts as a Lewis acid ?
  1. $\left(\mathrm{CH}_3\right)_3 \mathrm{~N}$
  2. $\left(\mathrm{CH}_3\right)_3 \mathrm{~B}$
  3. $\left(\mathrm{CH}_3\right)_2 \mathrm{O}$
  4. $\left(\mathrm{CH}_3\right)_3 \mathrm{P}$

Solution

$\left(\mathrm{CH}_3\right)_3 \mathrm{~B} \rightarrow$ is electron efficient compound, so behaves as Lewis acid.

Asked in: NEET 2009 (Mains)

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