Which halogen halide is least reactive?

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HCl

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HBr

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Solution

The correct option is D HF
The rate of reaction increases as you go from HF to HCl to HBr to HI. The reason for this is that as the halogen atoms get bigger, the strength of the hydrogen halide bond decreases.

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By the reduction of alkyl halides, we get alkanes. The best alkyl halide contains which halogen?

s p^{2}

s p^{3}

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