Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) Physical and Chemical Properties of Group 17th Elements Single Correct MCQ
Published on: August 14, 2026

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

A
HF
B
HCl
C
HBr
D
HI

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The correct answer is:
A

As the size of halogen atom increases down the group from F to I, the strength of H – X bond decreases and hence bond dissociation enthalpy decreases. Thus, HF has highest bond dissociation enthalpy.

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