Class 12th

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(d) All soaps are made by boiling fats or oils with suitable hydroxide. Variations are made by adding different raw materials. Sodium laurylsulphate and sodium dodecylbenzenesulphonate are anionic detergents.

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

Ans: The Correct option is b.

Ascorbic acid is the chemical name for vitamin C. Aspartic acid is an amino acid, adipic acid is a dicarboxylic acid with an eight-carbon chain, and saccharic acid is a dicarboxylic acid made by oxidising glucose with HNO₃ Vitamin C is a water-soluble vitamin that serves a variety of activities in the human body.

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Ans:  (C)

Because of the electron-releasing nature of the alkyl group, it (R) pushes electrons towards nitrogen, making the unshared electron pair more available for sharing with the acid's proton. Furthermore, the +I effect of the alkyl group stabilizes the substituted ammonium ion formed from the amine by dispersing the positive charge.

As a result, alkylamines are more powerful bases than ammonia.

As a result, the basic nature of aliphatic amines should increase as the number of alkyl groups increases.

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct answer: (D) 

This is a multiple choice answer as classified in NCERT Exemplar

(b) The compound that causes general antidepressant action on the central nervous system belongs to the class of tranquilizers.

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

Ans: The Correct option is b.

The structure described in option (b) reflects sucrose, which has a C₁−C₂ glycosidic bond between α−D− glucose and β−D− fructose.

This is a non-reducing sugar since the reducing groups of glucose and fructose are involved in the creation of glycosidic linkages.

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Ans: (B) Triethylamine 

The structure of the given amines are shown below.

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(a) A narrow spectrum antibiotic is active against gram positive or gram negative bacteria.

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Hydrogen bonds hold the α− helical structure of proteins together. A polypeptide chain creates all potential hydrogen bonds by twisting into a

right-handed helix with the −NH group of each amino acid residue hydrogen linked to a>C=O neighboring turn of helix.

Correct option is C

This is a multiple choice answer as classified in NCERT Exemplar

(a) Salvarsan is arsenic containing drug which was first used for treatment of syphilis. Syphilis is an acute and chronic infections disease caused by the bacterium Treponema pallidum. It is a sexually transmitted infection. The primary route of transmission is through sexual contact but it may also be transmitted from mother to foetus during pregnancy or at birth.