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

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

AIPMTAIPMT 2010The p-Block Elements

Solution:

Electron deficient molecules $t$ as Lewis acid. Among the given molecules, only diborane is electron deficient, i.e. does not have complete octet . Thus, it acts as a Lewis acid. $ NH_3 \, and \, H_2O$ being electron rich molecules behave as Lewis base.