The electrophile in the addition of HBr to 1-butyne is the H atom in HBr.
An electrophile is a positively charged specie or an electron deficient specie which is able to accept a lone pair of electrons.
An electrophilic addition is one in which the attacking agent is a nucleophile. The electrophile in the addition of HBr to 1-butyne is the H atom in HBr.
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