Question

A student has been given a compound " x " of molecular formula $- C_{6}H_{7}\text{ }N$. ' $x$ ' is sparingly soluble in water. However, on addition of dilute mineral acid , ' x ' becomes soluble in water. ' x ' when treated with ${CHCl}_{3}$ and KOH (alc.) ' y ' is produced. ' y ' has a specific unpleasant smell. On treatment with benzenesulphonyl chloride, ' x ' gives a compound ' z ' which is soluble in alkali. The number of different "H" atoms present in ' $z$ ' is:-