Acetal is obtained by reacting which of the following in the presence of dry $HCl$ and alcohol?

An organic compound $(A)$ with molecular formula $C_8H_8O$ forms an orange-red precipitate with $2,4-DNP$ reagent and gives a yellow precipitate on heating with iodine in the presence of sodium hydroxide. It neither reduces Tollens' or Fehlings' reagent,nor does it decolourise bromine water or Baeyer's reagent. On drastic oxidation with chromic acid,it gives a carboxylic acid $(B)$ having molecular formula $C_7H_6O_2$. Identify the compounds $(A)$ and $(B)$ and explain the reactions involved.

The major product $'P'$ formed in this reaction is:

Compound '$A$' gives a positive test with $2,4-DNP$ and with $I_2/NaOH$. Compound '$A$' may be:

Which one of the following reactions will not result in the formation of a carbon-carbon bond?

Which of the following does not give a stable product with water?