Addition of halogen acids to alkynes occur in accordance with Markownikoff’s rule. Addition onemolecule of halogen acid gives an unsaturated halide, which then adds another molecule of hydrogen halide to form gem dihalides. For example, addition of HI to propyne first gives 2-iodipropene and then 2, 2-iodopropane.
The order of reactivity of halogen acids towards addition reaction is H–I > H– Br > H-Cl.
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