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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?

NTA AbhyasNTA Abhyas 2022

Solution:

$B_{2}H_{6}$ is a Lewis acid here as it is electron deficient (6 electron) so it can accept electrons. $NH_{3},H_{2}O$ are Lewis bases as they have lone pair of electrons to donate. $CH_{4}$ is neither Lewis acid nor Lewis base as it can not donate (have no lone pair) or accept electron (have no vacant orbital).