Which one of the following reactions is expected to readily give a hydrocarbon product in good yields?

1. $\mathrm{RCOOK} \frac{\text { Electrolytic }}{\text { oxidation }}$
2. $\mathrm{RCOO}^{-} \mathrm{Ag}^{+} \stackrel{\mathrm{Br}_{2}}{\longrightarrow}$
3. $\mathrm{CH}_{3} \mathrm{CH}_{3} \xrightarrow[\mathrm{hv}]{\mathrm{Cl}_{2}}$
4. $\left(\mathrm{CH}_{3}ight)_{3} \mathrm{CCl} \stackrel{\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}}{\longrightarrow}$

Solution

Electrolysis of sodium or potassium salt of carboxylic acid gives good yield of hydrocarbon


At anode $2 R C O O^{-} \longrightarrow R C O \dot{O}+2 e^{-}$
$2 R C O \dot{O} \longrightarrow R-R+2 C O_{2}$
At cathode $2 K^{+}+2 e^{-} \longrightarrow 2 K$
$2 \mathrm{~K}+\mathrm{H}_{2} \mathrm{O} \longrightarrow 2 \mathrm{KOH}+\mathrm{H}_{2} \uparrow$ ^

Asked in: JEE-TOPICTESTS-CHEMISTRY

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