Chemistry

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: option (B and C) 

Certain mild reducing agents like hypophosphorous acid (phosphinic acid) or ethanol reduce diazonium salts to arenes and themselves get oxidised to phosphorous acid and ethanol, respectively.

This is a Multiple Answer Type Questions as classified in NCERT Exemplar

Correct options are b and d.

Acidic amino acids are divided into two groups, one -COOH group against the other - NH₂ group. As a result, the acidic amino acids (b) and (d) are the only ones among the supplied structures.

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: (A and B)

When aliphatic and aromatic primary amines are heated with chloroform and ethanolic potassium hydroxide, they form isocyanides or carbylamines, which have a foul odor. This reaction does not occur in secondary or tertiary amines.

This is a Multiple Answer Type Questions as classified in NCERT Exemplar

Correct options are b and d.

Amylopectin and Glycogen are the correct choices since they are carbohydrate storage forms found in animal tissues, whereas amylose is made up of 80-85% starch. It's also a branched glucose polymer that branches via C₁ - C₆  glycosidic linkage.

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: (A, B & C) 

Nitro compounds are reduced to amines by passing hydrogen gas through an acidic medium containing finely divided nickel, palladium, or platinum, as well as by reduction with metals in an acidic medium.

This is a Multiple Answer Type Questions as classified in NCERT Exemplar

Correct options are a and c.

Globular protein is a protein structure that forms when a chain of polypeptides coils around to produce a spherical shape. Insulin and albumin are two examples of water-soluble globular proteins. As a result, (a) and (c) are the correct answers.

This is a Multiple Answer Type Questions as classified in NCERT Exemplar

Correct options are b and d.

Sucrose is a common disaccharide that breaks down into an equimolar mixture of D- (+)- glucose and D- (-)- fructose when hydrolyzed. These two monosaccharides are held together by a glycosidic bond between C₁ of α - glucose and C₂ of β fructose. Because the reducing groups of glucose and fructose are involved in the formation of glycosidic linkages, sucrose is a non-reducing sugar.

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: (C and D) 

Chlorobenzene and bromobenzene are prepared by the sandmeyer's reaction. 

While fluorobenzene and iodobenzene are prepared by simple heating of diazonium salt with aqueous KI Solution.

This is a Multiple Answer Type Questions as classified in NCERT Exemplar

Correct option is C.

The links between C₁ and C₄ of glucose are shown as 'A' and ' C, ' respectively, whilst the linkage between C₁ and C₆ of the glucose units is shown as ' B. ' Furthermore, option (c) is clearly correct based on the structures.

Because ' B ' is the bond or link between the glucose units of C1 and C6 and, option (b) is wrong.

Option (a) is wrong because the relationship between C₁ and C₄ and is represented by 'C.'

Because 'A' is the hyperlink between C₁ and C₄ the glucose units of and, option (d) is wrong.

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: (D)

Aliphatic and arylalkyl primary amines can be prepared by the reduction of the corresponding nitriles with LiAlH₄

Heating alkyl halide with primary, secondary and tertiary amine can be prepared by reduction of LiAlH4 followed by treatment with water.

Heating alkyl halide with potassium salt of phthalimide followed by hydrolysis produces primary amine. This process is known as Gabriel phthalimide reaction. The number of carbon atoms in the chain of amines of product is same as reactant.