Which of the following molecules will have smallest bond enthalpy?

H-I

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H-F bond

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H-Cl

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H-Br

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Solution

The correct option is A
H-I

One of the factors affecting bond enthalpy is size of atoms.

Smaller is the size of bonded atoms, stronger is the bond.

Consequently larger is the value of bond dissociation enthalpy.

Since size of I is largest its bond enthalpy will be least.

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