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Q.

Which one of the following molecular hydrides acts as a Lewis acid 
 

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a

PH3 
 

b

C2H6 
 

c

SiH4 
 

d

B2H6 
 

answer is A.

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Detailed Solution

Lewis Acid: The species which acts as electron pair acceptor.

Any species which has vacant orbital or electron deficient acts as Lewis acids.

B2H2 (diborane) is a electron deficient acts as Lewis acid.

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