1-Penten-4-yne reacts with bromine at $- 80^{o} C$ to produce:

4, 4, 5, 5 - t e t r a b r o m o p e n t e n e

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1, 2 - d i b r o m o - 1, 4 - p e n t a d i e n e

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1, 1, 2, 2, 4, 5 - h e x a b r o m o p e n t e n e

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4, 5 - d i b r o m o - 1 - p e n t y n e

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Solution

The correct option is D $4, 5 - d i b r o m o - 1 - p e n t y n e$
1-Penten-4-yne reacts with bromine at 80C to produce
4,5-dibromopentyne. A molecule of bromine is added across carbon carbon double bond. Tripple bond is not affected.

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