If ethylene,carbon monoxide and water are heated at high temperature,which of the following is formed?

Which of the following on hydrolysis forms acetic acid?

What is the product $P$ in the given reaction?

What is the final product of the following reaction sequence?
$C_4H_8$ $\xrightarrow[\text{peroxide}]{\text{HBr}} X$ $\xrightarrow[\text{(ii) } CO_2]{\text{(i) Mg/dry ether, (iii) } H_3O^+} Y$

Hydrolysis of $CH_3CH_2NO_2$ with $85\%$ $H_2SO_4$ gives

What is obtained when glycerol is heated with oxalic acid at $110\,^{\circ}C$?