The matching of reagents with their respective named reactions is as follows:
A. NH2−NH2,KOH (Hydrazine in basic medium) is the reagent for Wolff-Kishner Reduction, which reduces carbonyl groups to alkanes. So, A matches with III.
B. [Ag(NH3)2]OH (Ammoniacal silver nitrate) is Tollen's reagent used for Tollen's Test to identify aldehydes. So, B matches with I.
C. Aqueous CuSO4 (Fehling's A) and Sodium potassium tartarate in KOH (Fehling's B) are the components of Fehling's solution used for Fehling's Test. So, C matches with IV.
D. Zn−Hg,HCl (Zinc amalgam in concentrated hydrochloric acid) is the reagent for Clemmensen Reduction, which reduces carbonyl groups to alkanes. So, D matches with II.
The correct matching is A-III, B-I, C-IV, D-II.