Considering the above chemical reaction, identify the product "X" :

Match List - I with List - II

	List - I (process)		List - II (catalyst)
(a)	Deacron's process	(i)	ZSM-5
(b)	Contact process	(ii)	$$CuC{l_2}$$
(c)	Cracking of hydrocarbons	(iii)	Particles 'Ni'
(d)	Hydrogenation of vegetable oils	(iv)	$${V_2}{O_5}$$

Choose the most appropriate answer from the options given below :

Given below are two statements : One is labelled as Assertion A and the other labelled as reason R

Assertion A : During the boiling of water having temporary hardness, Mg(HCO₃)₂ is converted to MgCO₃.

Reason R : The solubility product of Mg(OH)₂ is greater than that of MgCO₃.

In the light of the above statements, choose the most appropriate answer from the options given below :

The number of ionisable hydrogens present in the product obtained from a reaction of phosphorus trichloride and phosphonic acid is :