Regioselectivity for addition of mole of hydrogen bromide


Write a stepwise mechanism using arrows to show movement of electrons for the reaction of 1-butyne with hydrogen bromide to produce 2,2-dibromobutane.

CH3CH2CCH + 2HBr --------->CH3CH2CBr2CH3

Provide reasoning for the observed regioselectivity for addition of each mole of hydrogen bromide.

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Physics: Regioselectivity for addition of mole of hydrogen bromide
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