Explain fehling's solution and tollen's reagent in detail and explain which type of compounds reduces these two reagents

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Q. Which of the following will reduce Tollens reagent? Explain.

An aqueous solution of metal ion M1 reacts separately with reagents Q and R in excess to give tetrahedral and square planar complexes, respectively. An aqueous solution of another metal ion M2 always forms tetrahedral complexes with these reagents. Aqueous solution of M2 on reactionn with reagent S gives white precipitate which dissolves in excess of S. The reactions are summarised in the scheme given below:
SCHEME:

Reagent S is

E t - O | | C - C l D I B A L - H - ------ \to H_{2} O (X)

P h - C \equiv N i . S n C l_{2} + H C l - ------- \to i i . H_{3} O^{+} (Y)

(X) and (Y) can be differnetiated by:

Q. Which of the following disaccharides will not reduce Tollens reagent?

(IIT-JEE, 2005)

Q. An organic compound (A) with molecular formula,

C_{8} H_{8} O

forms an orange-red precipitate with 2,4-DNP reagent and gives yellow precipitate on heating with iodine in the presence of sodium hydroxide.It neither reduces Tollens' or Fehling's reagent, nor does it decolourise bromine water or Baeyer's reagent.On drastic oxidation with chromic acid, it gives a carboxylic acid (B) having molecular formula,

C_{7} H_{6} O_{2}

. Identify the compounds (A) and (B) and explain the reactions involves.

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