Question

All pentahalides are lewis acid give reason​

Answer 1

Answer:

Answer:- (A) Both halides can accept electrons from a donor to complete their octet.

∵ Lewis acid is defined as an electron-pair acceptor and both boron and aluminium in their tri-halides (MX  

3

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) possess six electrons in their valence shell.  

Hence, to complete their octet, they can accept a lone pair of electrons.

Thus, both behave as Lewis acid.

Answer 2

Answer:

here it is

Explanation:

Halides can accept electrons from a donor to complete their octet.

Since Lewis acid is defined as an electron-pair acceptor and 15 group elements in their penta-halides (EX5) possess six electrons in their valence shell.  

Hence, to complete their octet, they can accept a lone pair of electrons.

Thus, both behave as Lewis acid.