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Higher Alkynes from Alkynes

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Question

A compound $(A)$ $C_{5} H_{10} C l_{2}$ on hydrolysis gives $C_{5} H_{10} O$ which reacts with $N H_{2} O H$ , forms iodoform but does not give Fehling's test. $(A)$ is:

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Solution

Groups like $C H_{3} - C O - R$ gives iodoform test, but since it is acetone like species or ketone, which do not give Fehling's test due to less electrophilicity of carbonyl carbon.

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