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Which is the most suitable reagent among...

Which is the most suitable reagent among the following distinguish compound (3) from the others ?
(1) `CH_3C-= C-CH_3`
(2) `CH_3CH_2 -CH_2 -CH_3`
(3) `CH_3 CH_2 C-=CH`
(4)` CH_3 CH =CH_2`

A

Bromine in carbon tetrachloride

B

Bromine in acetic acid solution

C

Alk. `KMnO_4`

D

Ammonical silver nitrate

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The correct Answer is:
D

Terminal alkyne will reacts with Tollen.s reagent,
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