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Consider the following reactions: A Ag2O / ppt A Hg2+ / H+ B NaBH4 C ZnCl2 / conc. HCl Turbidity within 5 minutes 'A' is:

1. CH3-CCH
2. CH2=CH2
3. CH3-CC-CH3
4. CHCH

Correct answer: CH3-CC-CH3

Solution

The correct option, CH3-C≡C-CH3, indicates the presence of a terminal alkyne, which can react with silver oxide (Ag2O) to form a precipitate. This reaction is characteristic of alkynes, leading to turbidity due to the formation of silver acetylide.

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