When Conc. `H_2SO_4` is treated with chloride salt, a colourless pungent smelling HCl gas is produced, but when the same acid is treated with Bromide salt we get red vapour of bromine Explain.

What happens when: Sucrose is treated with concentrated H_2SO_4 .

2-methyl, 2-methoxy propane gives 2-iodo 2-methyl propane when treated with the HI but anisole produces phenol on the same treatment. Explain.

2-methyl-2-methoxy propane gives 2-iodo 2-methyl propane when treated with the HI but anisole produces phenol on the same treatment, Explain.

An organic compound X(C_2H_4O) , on oxi-dation, gives Y(C_2H_4O_2) . Compound (X) undergoes haloform reaction. On treatment with HCN, compound (X) produces Z which on hydrolysis, gives 2-Hydroxypropanoic acid. Write the equation for the reactions involved. What happens when X is treated with dilute NaOH?