Give the decreasing order of acidic strength of the following:
a. $C H_{4}$
b. $H_{2} O$
c. $H F$
d. $N H_{3}$
e. $L i H$
f. $B e H_{2}$

b > d > c > a > f > e

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c > b > d > a > f > e

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s > b > e > c > d > f

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c > d > a > b > e > f

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Solution

The correct option is B $c > b > d > a > f > e$
The decreasing order of acidic strength is $H F > H_{2} O > N H_{3} > C H_{4} > B e H_{2} > L i H$ ( $c > b > d > a > f > e$ ).
As the electronegativity difference decreases, the stabilization of the anion formed by deprotonation decreases and the acid strength decreases.

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