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BITSAT 2013
Exam
BITSAT
Year
2013
Subject
Chemistry
Chapter
Hydrocarbons

BITSAT 2013 · Chemistry · Hydrocarbons

Which one of the following reactions is expected to readily give a...

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

Options

  1. ARCOOK Electrolytic  oxidation \mathrm{RCOOK} \frac{\text{ Electrolytic }}{\text{ oxidation }}
  2. BRCOO−Ag+⟶Br2\mathrm{RCOO}^{-} \mathrm{Ag}^{+} \stackrel{\mathrm{Br}_{2}}{\longrightarrow}
  3. CCH3CH3Cl2hu\mathrm{CH}_{3} \mathrm{CH}_{3} \frac{\mathrm{Cl}_{2}}{\mathrm{hu}}
  4. D(CH3)3CCl⟶C2H5OH\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CCl} \stackrel{\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}}{\longrightarrow}

Correct answer

A. RCOOK Electrolytic  oxidation \mathrm{RCOOK} \frac{\text{ Electrolytic }}{\text{ oxidation }}

Step-by-step solution

Electrolysis of a concentrated aqueous solution of either sodium or potassium salts of saturated carboxylic acids yields higher alkane at anode. 2 RCOOK Electrolytic  Oxidation ⟶2RCOO− Anode +2 K+ Cathod \mathrm{RCOOK} \underset{\text{ Oxidation }}{\text{ Electrolytic }}{\longrightarrow} \underset{\text{ Anode }}{2 \mathrm{RCOO}^{-}}+\underset{\text{ Cathod }}{2 \mathrm{~K}^{+}}At anode 2RCOO−→2RCOO+2\mathrme−⟶R−R+2 \mathrm{RCOO}^{-} \rightarrow 2 \mathrm{RCOO}+2 \mathrme^{-} \longrightarrow\mathrm{R}-\mathrm{R}+2 CO2\mathrm{CO}_{2}At Cathode 2 K++2\mathrme−→2 K2 \mathrm{~K}^{+}+2 \mathrme^{-} \rightarrow 2 \mathrm{~K} 2  K+H2O→\mathrm{~K}+\mathrm{H}_{2} \mathrm{O} \rightarrow2 KOH+H2↑(\mathrm{KOH}+\mathrm{H}_{2} \uparrow (Kolbe's Method)
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