Lead pipes are corroded quickly by

The alcohol that produces turbidity immediately with $ZnCl_2 +$ conc. $HCl$ at room temperature is:

$A$ hydroxy compound $(X)$ with molar mass $122 \ g \ mol^{-1}$ 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 $290 \ g \ mol^{-1}$. The number of hydroxyl groups present in compound $(X)$ is :

Tonics in general contain

The number of primary alcohols possible with the formula $C_4H_{10}O$ is :-

$A$ mixture of methanol vapours and air is passed over heated copper. The products are