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VITEEE 2015 Paper

Section: Chemistry

Question : 80 of 120

Marks: +1, -0

Which of the following reactions is used to prepare isobutane?

Solution:

3 -methylbutanoic acid gives isobutane on decarboxylation i.e.,

\mathrm{CH}_3-\underset{\mathrm{CH}_3}{\underset{\vert}{\mathrm{CH}}}-\mathrm{CH}_2\mathrm{COOH}

\xrightarrow[\Delta]{\mathrm{NaOH}/\mathrm{CaO}}

3-methylbutanoic acid

\mathrm{CH}_3-\underset{\mathrm{CH}_3}{\underset{\vert}{\mathrm{CH}}}-\mathrm{CH}_3 + \mathrm{CO}_2

↑

While Wurtz reaction of

\mathrm{C_2H_5Br}

gives, n-butane and hydrolysis of n-butyl magnesium bromide gives n-butane but reduction of propanol with HI/P gives propane

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