Compound $\text{'}\mathrm{A}\text{'}$ (molecular formula ${\mathrm{C}}_3{\mathrm{H}}_8\mathrm{O}$) is treated with acidified potassium dichromate to form a product $\text{'}\mathrm{B}\text{'}$ (molecular formula ${\mathrm{C}}_3{\mathrm{H}}_6\mathrm{O}$). $\text{'}\mathrm{B}\text{'}$ forms a shining silver mirror on warming with ammoniacal silver nitrate. $\text{'}\mathrm{B}\text{'}$, when treated with an aqueous solution of ${\mathrm{H}}_2{\mathrm{NCONHNH}}_2\mathrm{HCl}$ and sodium acetate, gives a product $\text{'}\mathrm{C}\text{'}$. Identify the structure of $\text{'}\mathrm{C}\text{'}$.

The reaction of ${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{CH}=\mathrm{CHCHO}$ with ${\mathrm{NaBH}}_4$ gives

The oxidation of acetaldehyde with selenium dioxide produces

From which of the following can we obtain tertiary butyl alcohol, by the action of methyl magnesium iodide?

Which of the following will not give the iodoform test?

Clemmensen reduction of a ketone is carried out in the presence of

Which of the following gives aldol condensation with the maximum possible yield?

Propanal, on reaction with dilute $\mathrm{NaOH}$ forms: