Chemistry - Hydrocarbon Question with Solution | TestHub

Question Explanation:

The question asks to identify the starting compound A (an alkyne or alkene) based on a sequence of reactions.

Concept:

This question is based on reactions of terminal alkynes (Tollen's test and hydration), Reduction of ketones and Lucas test.

Solution:

Compound A is identified as a terminal alkyne because it precipitates with Ag₂O. Compound C is a secondary alcohol, as indicated by turbidity within 5 minutes with Lucas reagent.

Overall, A is a terminal alkyne that, upon hydration in the presence of Hg⁺², yields a ketone. This ketone then reduces to a secondary alcohol with NaBH₄ .

Therefore, A is Propyne.

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