Which of the following are obtained as the only product after hydration of suitable alkyne with ${\mathrm{H}}_2{\mathrm{SO}}_4,$ and ${\mathrm{HgSO}}_4?$

Which of the following statement is/are true.

$\left(1\right)$ The reaction of methyl magnesium bromide with acetone followed by hydrolysis gives secondary alcohol.

$\left(2\right)$ Aldehydes are more reactive than ketones.

$\left(3\right)$ The yield of ketone, when a secondary alcohol is oxidised, is more than the yield of aldehyde when primary alcohol is oxidised by ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7/{\mathrm{H}}^{\oplus }$

$\left(4\right)$ Both aldehydes and ketones reduce Tollen's reagent.

Which of the following statement is/are correct.

$\left(1\right)$ To prepare ethanol, ${\mathrm{CH}}_3\mathrm{Mgl}$ is treated with the other reagent $\mathrm{HCHO}.$

$\left(2\right)$ Urotropine is formed by the action of $\mathrm{HCHO}$ with ${\mathrm{NH}}_3.$

$\left(3\right)$ The conversion of acid chlorides into aldehydes by reduction is termed Rosenmund's reduction.

$\left(4\right)$ Aldehyde show reducing properties due to their ready conversion into ketons.

Find out the No. of compounds that undergo decarboxylation in the presence of heat