The concentrated aqueous solution of potassium salts of acetic acid and propanoic acid are electrolyzed. Which of the following are produced?

C H_{3} C H_{2} C H_{2} C H_{2} C H_{3}

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C H_{3} C H_{2} C H_{2} C H_{3}

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C H_{3} C H_{2} C H_{3}

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C H_{3} C H_{3}

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Solution

The correct options are
B $C H_{3} C H_{2} C H_{2} C H_{3}$
C $C H_{3} C H_{2} C H_{3}$
D $C H_{3} C H_{3}$
Given $C H_{3} C O O^{-} K_{(a q)}^{+} a n d C H_{3} C H_{2} C O O^{-} K_{(a q)}^{+}$
Now, they are electrolysed
$C H_{3} C O O^{-} K^{+} \to C H_{3} C O O^{-} + K^{+}$
$C H_{3} C H_{2} C O O^{-} K^{+} \to C H_{3} C H_{2} C O O^{-} + K^{+}$
At anode $C H_{3} C O O^{-} \to C H_{3} C O ˙ O + 1 e^{-}$
$C H_{3} C H_{2} C O O^{-} \to C H_{3} C H_{2} C O ˙ O + 1 e^{-}$
$C H_{3} C O ˙ O \to ˙ C H_{3} + C O_{2}$
$C H_{3} C H_{2} C O ˙ O \to C H_{3} ˙ C H_{2} + C O_{2}$
$∴$ Products obtained are:
$˙ C H_{3} + ˙ C H_{3} \to C_{2} H_{6} e t h a n e$
$C H_{3} ˙ C H_{2} + ˙ C H_{3} \to C H_{3} C H_{2} C H_{3} p r o p a n e$
$C H_{3} ˙ C H_{2} + C H_{3} ˙ C H_{2} \to C_{4} H_{10} b u t a n e$
At cathode
$2 H_{(a q)}^{+} f r o m H_{2} O + 2 e^{-} \to H_{2} (g)$

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