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Question

An unknown compound ( A) has a molecular formula C4 H6. When (A) is treated with excess of Br2 a new substance (B) with formula C4H6 Br4 is formed. (A) forms a white ppt. with ammoniacal silver nitrate. Compound A is


A

But-1-yne

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B

But-2-yne

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C

But-1-ene

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D

But-2-ene

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Solution

The correct option is A

But-1-yne


A is C4H6

Degree of unsaturation

= No of carbon atoms + 112 {No of H atoms + No of halogen atoms - No of Nitrogen atoms}

=4+162

=53=2

Ammoniacal AgNO3 is Tollen's reagent.
Terminal alkynes

RCCHAgNO3/NH3−−−−−−−RCCAg
(Whiteppt)

Given compound is a terminal Alkynes.
So only option (A) is appropriate.


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