Question

Above compounds can be differentiated by using the reagent :
A.
$$NaOH,$$ Tollen's reagent, $$FeC{l_3}$$
B.
$$Cr{O_3},$$ Tollen's reagent, $$FeC{l_3}$$
C.
Tollen's reagent, $$Cr{O_3},FeC{l_3}$$
D.
$$Na,$$ Tollen's reagent, $$FeC{l_3}$$
Answer :
$$Cr{O_3},$$ Tollen's reagent, $$FeC{l_3}$$
Solution :