Answer.
(i) Ethene is used for artificial ripening of fruits.
(ii) Acetylene is used as oxy-acetylene flame. It is highly exothermic reaction. Heat released is used for welding purpose.
(iii) Chloroform is used as a solvent for rubber, waxes etc., for anesthesia.
(iv) Carbon tetrachloride is used as an industrial solvent and in dry cleaning.