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Q.

Bond energy is least in the following

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a

HF

b

HCl

c

HBr

d

HI

answer is D.

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Detailed Solution

Among all hydrogen halides, HI has the least bond energy. Because the size of iodine is so large compare to F, Cl or Br atoms. Thus, the attraction force between bonding electrons of H and I atoms is very small. Therefore, the bond dissociation energy is least.

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