Glucose reacts with methyl alcohol to form two types of glycosides: α -methyl glycoside and β -methyl glycoside.

Molisch's test (named after Austrian botanist Hans Molisch) is a sensitive chemical test for the presence of carbohydrates, based on the dehydration of a carbohydrate by sulphuric acid to produce an aldehyde, which condenses with two molecules of phenol (usually α -naphthol, though other phenols (e.g. resorcinol, thymol) also give colored products), resulting in a red or purple-coloured compound.

In the glycolysis of glucose, two molecules of ADP get converted to two molecules of ATP.

Sucrose, C₁₂H₂₂O₁₁, is a disaccharide composed of D-glucose and D-fructose monosaccharides.

We know that glucose reacts with one molecule of phenylhydrazine to give phenylhydrazone. When warmed with excess of phenylhydrazine, the secondary alcoholic group adjacent to the aldehyde group is oxidised by another molecule of phenylhydrazine to a ketonic group. With this ketonic group, the third molecule of phenylhydrazine condenses to glucosazone. Therefore, the value of 'X' is 3.

Glucose reacts with phenyl hydrazine in equimolar proportion to form phenyl hydrazone. However, with excess phenyl hydrazine, it forms glucosazone. In this reaction, one molecule of glucose reacts with three molecules of phenyl hydrazine.

The Molisch's test confirms that the compound is a carbohydrate which rules out option (2).
Benedict's test confirms that it is a reducing sugar which rules out option (1).

Since it does not give a positive Seliwanoff's test [rules out option (3)], so it must be a reducing sugar containing an aldehyde group.
So, the compound is maltose.

Molasses is a thick, dark brown juice obtained from raw sugar during the refining process. Beet molasses is 50% sugar by dry weight, predominantly sucrose, but contains significant amounts of glucose and fructose.

(A) α -amylose is an unbranched chain and its molecular weight = 1,000-10,00,000
Thus, (A)–(d)
(B) β-amylose is a branched chain and its molecular weight = 50,000-10,00,000
So, (B)–(c)
(C) Cellulose is an unbranched chain and its molecular weight = 20,000-5,00,000
So, (C)–(b)
(D) The molecular weight of glycogen = 10,00,000- 50,00,000
Thus, (D)–(a)

The Biuret reagent is made of sodium hydroxide and copper sulphate. The blue reagent turns violet in the presence of proteins, and changes to pink when combined with short-chain polypeptides. Hence, option (1) is correct.

The Beilstein test is a simple chemical test used in chemistry as a qualitative test for halides.
Benedict's reagent is used as a test for the presence of reducing sugars.

Molisch's test is a sensitive chemical test for the presence of carbohydrates.