Which of the following has least tendency to liberate $$\mathrm{H}_{2}$$ from mineral acids?

Match List - I with List - II.

	List - I		List - II
(A)		(I)	Spiro compound
(B)		(II)	Aromatic compound
(C)		(III)	Non-planar Heterocyclic compound
(D)		(IV)	Bicyclo compound

Choose the correct answer from the options given below :

Choose the correct option for the following reactions.

Among the following marked proton of which compound shows lowest $$\mathrm{pK}_{\mathrm{a}}$$ value?