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Q.

The order of reactivity of acetylene with halogen acids is

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a

HI<HBr<HCl

b

HI>HBr>HCl

c

HI>HBr<HCl

d

HI<HBr>HCl

answer is A.

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Detailed Solution

More reactivity is possible because dissociation energy decreases as bond length increases.
From HCl to HI, the bond length of halogen acids rises.
∴ The halogen acids react to alcohol in the following order: HI>HBr>HCl

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