Aspirin is the acetylation product of .......

Cresol has which of the following functional groups?

If the reaction sequence given below is carried out with $15$ moles of acetylene,the amount of the product $D$ formed (in $g$) is. . . . . The yields of $A, B, C$ and $D$ are given in parentheses. [Given: Atomic mass of $H=1, C=12, O=16, Cl=35$]

Match the following acids with their respective $pK_a$ values:

Acid	$pK_a$
$(i)$ Phenol	$a. 10$
$(ii)$ $p-$Nitrophenol	$b. 7.1$
$(iii)$ Ethyl alcohol	$c. 16$
$(iv)$ Picric acid	$d. 0.78$

Phenol is:

Heating benzoic acid with $X$ or phenol with $Y$ gives benzene. $X$ and $Y$ are respectively: