Which one of the following compounds forms a quaternary salt on reacting with excess methyl iodide?

Which one of the following compounds forms a quaternary salt on reacting with excess methyl iodide?
  1. $\mathrm{C}_2 \mathrm{H}_5 \mathrm{OCH}_3$
  2. $\left(\mathrm{CH}_3ight)_2 \mathrm{CHOC}_2 \mathrm{H}_5$
  3. $\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2$
  4. $\mathrm{C}_6 \mathrm{H}_5 \mathrm{NO}_2$

Solution

Amines react with alkyl halide (excess) to give quaternary ammonium salt.
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Asked in: JEE-TOPICTESTS-CHEMISTRY

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