Which one of the following molecular hydrides acts as a Lewis acid ?

Options

A $\mathrm{NH}_3$
B $\mathrm{H}_2 \mathrm{O}$
C $\mathrm{B}_2 \mathrm{H}_6$
D $\mathrm{CH}_4$

Correct answer

C. $\mathrm{B}_2 \mathrm{H}_6$

Step-by-step solution

Key Idea:- Electron deficient molecules behave as Lewis acid. Among the given molecules, only diborane is electron deficient, ie, does not have complete octet. Thus, it acts as a Lewis acid.

\mathrm{NH}_3

and

\mathrm{H}_2 \mathrm{O}

being electron rich molecules behave as Lewis base.

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