When but-1-en-3-yne reacts with HBr, the H+ adds to the triple bond. Why? If the H+ would have added to the double bond it would have given a resonance stabilized carbocation. On adding to the triple bond, a highly unstable vinyl carbocation is formed. Then why H+ adds to the triple bond? Though the addition to triple bond gives a resonance stabilized alkene, but what is more important : stable intermediate or stable product?

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Q. Compounds with single bond are stable than those with double or triple bonds.

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