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Which of the following reactions produces 2,2-dibromopropane?

1. CH3–CH=CH2 + HBr →
2. CH3–C≡CH + 2HBr →
3. CH3CH=CHBr + HBr →
4. CH≡CH + 2HBr →

Correct answer: CH3–C≡CH + 2HBr →

Solution

The reaction of propyne (CH3–C≡CH) with two equivalents of HBr adds bromine across the triple bond, resulting in the formation of 2,2-dibromopropane, as both bromine atoms attach to the same carbon atom.

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