The regioselectivity and stereospecificity in hydrohalogenation of an alkene is best described as:

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Hydrohalogenation of alkenes typically follows Markovnikov's rule, where the hydrogen atom bonds to the carbon with the greatest number of hydrogen atoms, and the halogen bonds to the other carbon. This reaction can proceed with both syn- and anti-addition, meaning the hydrogen and halogen can add to the same side of the alkene (syn) or opposite sides (anti), depending on the specific conditions and catalysts used.

The Regioselectivity and Stereospecificity in Hydrohalogenation of an Alkene Is