First slide

13th group or boron group

Question

Which of the following are Lewis acids?

Moderate

A

${PH}_{3} and {BCl}_{3}$
B

${AlCl}_{3} and {PH}_{3}$
C

${PH}_{3} and {SiCl}_{4}$
D

${BCl}_{3} and {AlCl}_{3}$

Solution

Electron pair acceptor is Lewis acid. In case of ${BCl}_{3} and {AlCl}_{3}$ both central atoms $(B, Al)$ have vacant p-orbitals and Incompleted octet. Hence they can accept a electron pair acts as Lewis acids.

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