1. Tardigrade
  2. Question
  3. Chemistry
  4. Among BMe3 , BF3 , BCl3 and B2H6 which one will be the best Lewis acid ?

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Q. Among $ BMe_3 $ , $ BF_3 $ , $ BCl_3 $ and $ B_2H_6 $ which one will be the best Lewis acid ?

UPSEEUPSEE 2005

Solution:

Electron acceptors are acids among given choices.

(i) $BF _{3}$ and $BCl _{3}$ are better Lewis acid than $BMe _{3}$ and $B _{2} H _{6}$ due to -I eftect of $Cl$ and $F$.

(ii) Between $BCl _{3}$ and $BF _{3}, BCl _{3}$ is better Lewis acid due to lesser extent of $p \pi-p \pi$ back bonding in it.