Consider three metal chlorides $\mathrm{x}, \mathrm{y}$ and z , where x is water soluble at room temperature, y is sparingly soluble in water at room temperature and z is soluble in hot water. $\mathrm{x}, \mathrm{y}$ and z are respectively

Match the List-I with List-II

List-I Chloro derivative	List-II Example
A. Vinyl Chloride	I. CH$_2$ = CH - CH$_2$Cl
B. Benzyl Chloride	II. CH$_3$ - CH(Cl)CH$_3$
C. Alkyl Chloride	III. CH$_2$ = CHCl
D. Allyl Chloride	IV.

Choose the correct answer from the options given below :

$$ \text { The correct stability order of the following diazonium salts is } $$

A hydroxy compound $(\mathrm{X})$ with molar mass $122 \mathrm{~g} \mathrm{~mol}^{-1}$ is acetylated with acetic anhydride, using a large excess of the reagent ensuring complete acetylation of all hydroxyl groups. The product obtained has a molar mass of $290 \mathrm{~g} \mathrm{~mol}^{-1}$. The number of hydroxyl groups present in compound $(\mathrm{X})$ is: