Which one of the following molecular hydrides acts as a Lewis acid?
Show Hint
- \( {NH}_3 \)
- \( {H}_2{O} \)
- \( {B}_2{H}_6 \)
- \( {CH}_4 \)
The Correct Option is C
Solution and Explanation
A Lewis acid is a substance that can accept a pair of electrons. In the case of molecular hydrides:
- \( {NH}_3 \) (Ammonia) is a Lewis base because it has a lone pair of electrons on nitrogen that can be donated.
- \( {H}_2{O} \) (Water) is also a Lewis base due to the lone pairs on oxygen.
- \( {B}_2{H}_6 \) (Diborane) acts as a Lewis acid because boron atoms in diborane have an incomplete octet and can accept electron pairs.
- \( {CH}_4 \) (Methane) does not act as a Lewis acid because it does not have an empty orbital to accept electron pairs.
Thus, \( {B}_2{H}_6 \) (Diborane) is the only hydride that acts as a Lewis acid.
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