Which of the following has strongest bond?

H F

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H C l

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H B r

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H I

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Solution

The correct option is C $H F$
Let's look at the bond enthalpy of hydrogen bonds of $H F$ , $H_{2} O$ and $N H_{3}$ .
$H F$ $10 k c a l / m o l$
$H_{2} O$ $7 k c a l / m o l$
$N H_{3}$ $2 k c a l / m o l$
Higher the bond enthalphy means higher the strength of bond,
So the correct option is [A].

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