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Question

The order of increasing acidic strength of CH4,NH3,H2O,HF is :

A
CH4<NH3<H2O<HF
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B
HF<NH3<H2O<CH4
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C
HF<CH4<H2O<NH3
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D
NH3<H2O<CH4<HF
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Solution

The correct option is A CH4<NH3<H2O<HF
To predict their lewis acidities we shall evaluate the relative basicities of their conjugate bases, viz.CH3,NH2,OH,F
although size of central atom decreases from C to F, volume available to electron on the central atom decreases in he order: C,N,O,F
Thus the increasing basic character of these conjugate bases are CH3>NH2>OH>F
hence, order of increasing acidic strength is CH4<NH3<H2O<HF

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