The molecular formula of second homologue in the homologous series of mono carboxylic acids is

Question

$\mathrm{C}_2 \mathrm{H}_4 \mathrm{O}_2$

$\mathrm{C}_2 \mathrm{H}_2 \mathrm{O}_2$

$\mathrm{CH}_2 \mathrm{O}$

$\mathrm{C}_3 \mathrm{H}_6 \mathrm{O}_2$

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