An oxide of a bivalent metal on heating with coke gives a compound X and a gas Y. The gas Y reacts with chlorine gas to give a poisonous gaseous compound. X undergoes hydrolysis to give a hydrocarbon Z with two carbon atoms. Identify the compounds X, Y and Z. Also, give the reactions involved.

Explanation

(i) identification of hydrocarbons
(ii) identification of metal which gives hydrocarbon with two carbon atoms on hydrolysis
(iii) products formed on reaction of metal oxide with coke
(iv) reaction of gaseous product with chlorine