Which of the following reactions is correct?

Which of the following is a rich source of carbohydrates?

Dipole-induced dipole interactions are present in which of the following pairs?

If the freezing point of an aqueous solution of salt $MX_4$ $(\alpha = 90\%)$ is $-3\,^{\circ}C$,then its boiling point will be ......... $^{\circ}C$. (Assume it is $100\%$ ionized at boiling temperature and $k_f = 1.86\,K\,kg\,mol^{-1}, k_b = 0.52\,K\,kg\,mol^{-1}$)

The reaction of $CH_3-CH=CH-C_6H_4-OH$ with $HBr$ gives:

Which one of the following salts gives an acidic solution in water?