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ISC Class 12 Amines and Biomolecules — practice questions — page 4

Explore 108 free Amines and Biomolecules questions in ISC Class 12 Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Amines and Biomolecules questions and exercises with answers

Showing questions 91–108 of 108.

Nucleotides in a chain are joined by which linkage?Read the answer and worked solution →Hoffmann bromamide degradation treats an amide with bromine and:Read the answer and worked solution →Gabriel phthalimide synthesis is used to prepare only:Read the answer and worked solution →Aniline fails to undergo the Friedel-Crafts reaction because it:Read the answer and worked solution →Aromatic primary amines cannot be made by Gabriel synthesis because:Read the answer and worked solution →Introducing halogen using copper powder and a halogen acid is the:Read the answer and worked solution →The disease scurvy results from deficiency of:Read the answer and worked solution →A carbohydrate that cannot be hydrolysed further is a:Read the answer and worked solution →A monosaccharide holding an aldehyde group is called an:Read the answer and worked solution →In DNA, the complementary base pair to adenine (A) is:Read the answer and worked solution →The six membered ring form of glucose is called the:Read the answer and worked solution →Fructose is best described as a:Read the answer and worked solution →Commercial glucose is obtained by hydrolysing starch at:Read the answer and worked solution →Amylopectin makes up roughly what share of starch?Read the answer and worked solution →Order the steps to a coloured azo dyeRead the answer and worked solution →Carbohydrates are defined as optically active polyhydroxy:Read the answer and worked solution →Which combination correctly matches the two processes described in the notes for a galvanic cell?Read the answer and worked solution →The potential developed between the zinc rod and the solution due to its tendency to undergo oxidation is calledRead the answer and worked solution →

Worked practice questions

Nucleotides in a chain are joined by which linkage?

  1. Phosphoglucosyl
  2. Phosphoaldehyde
  3. Phosphodiester
  4. Phosphoglyceral
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Correct answer: C. Phosphodiester

1. The link runs between carbon five and carbon three. 2. A phosphate group bridges the two sugars. 3. That bridge is a phosphodiester linkage. _Source: syllabus Chemistry Part 2, Unit 10 'Biomolecules'_

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Hoffmann bromamide degradation treats an amide with bromine and:

  1. Sodium hydroxide
  2. Sodium hydrosulphide
  3. Calcium hypochlorite
  4. Calcium hydrogen oxide
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Correct answer: A. Sodium hydroxide

1. The amide is dissolved in water or ethanol. 2. Bromine is added along with a strong alkali. 3. That alkali is sodium hydroxide. _Source: syllabus Chemistry Part 2, Unit 9 'Amines'_

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Gabriel phthalimide synthesis is used to prepare only:

  1. Aromatic amides
  2. Aliphatic esters
  3. Primary amines
  4. Ternary amines
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Correct answer: C. Primary amines

1. Phthalimide gives a nitrogen anion with a single site. 2. Alkylation then hydrolysis frees that nitrogen. 3. Only a primary amine can result. _Source: syllabus Chemistry Part 2, Unit 9 'Amines'_

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