Acetone can be converted into pinacol by:

Which of the following gives aldol condensation reaction?

An aromatic compound $A$ (Molecular formula $C_{8}H_{8}O$) gives a positive $2,4-DNP$ test. It gives a yellow precipitate of compound $B$ on treatment with iodine and sodium hydroxide solution. Compound $A$ does not give Tollen's or Fehling's test. On drastic oxidation with potassium permanganate,it forms a carboxylic acid $C$ (Molecular formula $C_{7}H_{6}O_{2}$),which is also formed along with the yellow compound in the above reaction. Identify $A, B$ and $C$ and write all the reactions involved.

The reaction of $1-(\text{aminomethyl})cyclohexan-1-ol$ with $NaNO_2/HCl$ gives $A$. Identify $A$.

Which of the following will give a yellow precipitate $(ppt.)$ with iodine and alkali?

Reaction: $CH_3-CO-CH_2-CH_2-CH_2-CH_2-CHO \xrightarrow{HO^{-}/\Delta} \underset{(73\%)}{(A)}$
Product $(A)$ is