Low oxidation state of metals in their complexes are common when ligands :

The structure of A in the given reaction is :

Major product '$$\mathrm{B}$$' of the following reaction sequence is :

Match List - I with List - II.

	List - I		List - II
(A)		(I)	Gatterman Koch reaction
(B)	$$C{H_3} - CN\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{{H_3}{O^ + }}^{SnC{l_2}/HCl}} C{H_3} - CHO$$	(II)	Etard reaction
(C)		(III)	Stephen reaction
(D)		(IV)	Rosenmund reaction

Choose the correct answer from the options given below :