A student has been given a compound "\( x \)" of molecular formula \( \mathrm{C_6H_7N} \). ‘\( x \)’ is sparingly soluble in water. However, on addition of dilute mineral acid, ‘\( x \)’ becomes soluble in water. ‘\( x \)’ when treated with \( \mathrm{CHCl_3} \) and \( \mathrm{KOH\ (alc)} \), ‘\( y \)’ is produced. ‘\( y \)’ has a specific unpleasant smell. On treatment with benzene sulphonyl chloride, ‘\( x \)’ gives a compound ‘\( z \)’ which is soluble in alkali. The number of different “\( \mathrm{H} \)” atoms present in ‘\( z \)’ is:
