Consider the following reaction and select the best choice that represents the product:

Compound $(A), \, C_8H_9Br,$ gives a white precipitate when warmed with alcoholic $AgNO_3.$ Oxidation of $(A)$ gives an acid $(B), \, C_8H_6O_4.$ $(B)$ easily forms anhydride on heating. Identify the compound $(A).$

Which of the following processes does $NOT$ occur during the preparation of $CHCl_3$ from $C_2H_5OH$ and bleaching powder?

Phosgene is formed slowly from which one of the following on exposure to air and sunlight?

The main product of the following reaction will be:

Which of the following will give $S_N2$ reaction at the fastest rate?