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Out of following pair , point out the stronger Lewis acid and assign the reason:

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Out of following pair , point out the stronger Lewis acid and assign the reason: 

(a) BF3 and BH3 

(b) Sn+2 and Sn+4 

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(a) BF3 due to greater electronegativity of fluorine it withdraws more electrons from central 'B' atom 

(b) Sn+4 Greater is the charge on the ion greater is its Lewis acidic strength

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