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The hydrocarbon which decolorizes alkaline `KMnO_4` solution but does not give any precipitate with ammoniacal silver nitrate solution is

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The hydrocarbon which decolorizes alkaline `KMnO_4` solution but does not give any precipitate with ammoniacal silver nitrate solution is
A. benzene
B. acetylene
C. propyne
D. but-2-yne
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Correct Answer - D
Benzene does not decolorize alkaline `KMnO_4` while acetylene and propyne, due to terminal acidic H atom, give a precipitate with ammoniacal `AgNO_3`. Thus, the answer is but-2-yne
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