Which of the following reagents will convert propanoic acid into propan$-1-$ol?

What is formed when $HCOOH$ reacts with concentrated $H_2SO_4$?

How many of the following compounds react with $NaHCO_3$ to evolve $CO_2$ gas?
$I$: $3$-Nitrophenol
$II$: $2,4$-Dinitrophenol
$III$: $4$-Hydroxybenzoic acid
$IV$: $4$-Methylbenzoic acid
$V$: $4$-Chlorophenol
$VI$: $2,4$-Dinitrotoluene
$VII$: $4$-Hydroxybenzenesulfonic acid
$VIII$: $4$-Sulfobenzoic acid
$IX$: Squaric acid
$X$: Maleic acid

Which of the following substances among phenol,acetic acid,and $n$-hexanol will react with $NaHCO_3$ solution to produce a sodium salt and $CO_2$?

The strongest acid among the following is

Predict $A$ and $B$ in the following reaction sequence: