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  4. Which of the following yield both alkahe and alkene?

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Q. Which of the following yield both alkahe and alkene?

AFMCAFMC 2004

Solution:

Kolbe's method of electrolysis of organic acid can be used to prepare alkane (except methane) alkene and alkyne. This reaction follows free radical mechanism.
Preparation of ethane
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For ethyne
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For ethene
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Williamson synthesis
$\underset{\text{Sodium alkoxide}}{R - \bar{O} - \overset{+}{N}a} + \underset{\text{Alkyl halide}}{X - R'} \rightarrow \underset{\text{Ether}}{ROR'} + NaX$
Wurtz reaction is used to prepare higher alkanes
$R X+ Na +R X \xrightarrow{\text { dry ether}} R-R+ Na X$
$R X+ Na +R' X \longrightarrow $
$ \underbrace{R-R+R-R'+R'}_{\text {mixture of alkanes }}-R'+ Na X $
Sandmeyer reaction is used for preparation of chloroarenes and bromo arenes
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