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Standard XII

Chemistry

Preparation of Carboxylic Acids from Hydrocarbons

An unknown co...

Question

An unknown compound A has a molecular formula C₄H₆. When A is treated with an excess of Br₂ a new substance B with formula C₄ H₆ Br₄ is formed. A forms a white precipitate with ammonia cal silver nitrate solution. A may be

(a)Butyne-1

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(a)Butyne-2

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(a)Butane-1

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(a)Butane-2

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Solution

The correct option is A
(a)Butyne-1

We know about addition of Halogens.

Addition of Halogen: Alkyne on reaction with bromine water solution or solution of $B r_{2}$ in $C C l_{4}$ gives alkyne tetrabromide and the colour of solution disappears.

Since the molecule takes 2 moles of $B r_{2}$ . Therefore it is alkyne. Also it gives white ppt with Tollen's reagent therefore acidic H is present. Hence it is 1- Butyne.

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