Affinity for hydrogen decreases in the group from fluorine to iodine. Which of the halogen acids should have highest bond dissociation enthalpy?

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 A $H F$
$F$ being smallest has the shortest $H - F$ bond and therefore $H F$ has the highest bond dissociation energy.

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Similar questions

Why is chlorine the element with highest electron affinity if fluorine is at the top of the halogen group because electron affinity decreases down a group.

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C l > F > B r > I

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The heat of hydration and the basic character of halide ions follow the order:

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Affinity for hydrogen decreases in the group from fluorine to iodine. Which of the halogen acids should have highest bond dissociation enthalpy?

The correct option is A HFF being smallest has the shortest H−F bond and therefore HF has the highest bond dissociation energy.

The correct option is A $H F$
$F$ being smallest has the shortest $H - F$ bond and therefore $H F$ has the highest bond dissociation energy.