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Classification of Hydrocarbons

Which of the ...

Question

Which of the following reactants is suitable for preparation of methane and ethane by using one step only?

A

H_{2} C = C H_{2}

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B

C H_{3} O H

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C

C H_{3} - B r

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D

C H_{3} - C H_{2} - O H

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Solution

The correct option is C $C H_{3} - B r$
Preperation of alkane from alkyl halide :

Methane preparation from $C H_{3} B r$ :

$C H_{3} - B r + H_{2} Z n, d i l . H C l ⟶ C H_{4} + Z n B r_{2}$
Here $Z n, d i l . H C l$ acts as reducing agent.

Ethane preperation from $C H_{3} B r$ :
Wurtz reaction :

$C H_{3} - B r + 2 N a + B r - C H_{3} Dry ether ⟶ C H_{3} - C H_{3} + 2 N a B r$

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Classification of Hydrocarbons

Standard XII Chemistry

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