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Punjab (PTB) · Chapter test · Free

2nd Year Chemistry Chapter 8 TestORGANIC NITROGEN COMPOUNDS

30 marks · 40 minutes · 21 questions. Covers: CHAP 24: ORGANIC NITROGEN COMPOUNDS.

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2nd Year Chemistry Chapter 8 Test

2nd Year · Chemistry · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 30Time: 40 minutes

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

  1. What by-product is released during the alkylation of methanamine with bromoethane?

    1. H2O

    2. HBr

    3. HCI

    4. NH3

  2. What type of compound is formed when a primary amine reacts with nitrous acid (HNO2)?

    1. Nitroamine

    2. Insoluble yellow oily liquid

    3. Aliphatic alcohol with nitrogen gas evolution

    4. Quaternary salt

  3. Caffeine in coffee and theobromine in chocolate are examples of:

    1. Inorganic salts

    2. Organic nitrogen compounds

    3. Synthetic polymers

    4. Simple hydrocarbons

  4. Which locating agent is sprayed onto an electrophoresis sheet to reveal amino acids as purple spots?

    1. Benedict's reagent

    2. Ninhydrin

    3. Tollens' reagent

    4. Litmus indicator

  5. The compound formed by coupling benzenediazonium chloride with N,N-dimethylphenylamine is known as:

    1. Butter yellow

    2. Methyl red

    3. Indigo

    4. Phenolphthalein

  6. A Zwitterion is also properly referred to as a(n):

    1. Cation

    2. Anion

    3. Dipolar ion

    4. Neutral molecule without charges

  7. An aqueous solution of glycine is neutral because of the formation of:

    1. Carbanion

    2. Carbocation

    3. Zwitterion

    4. Free radical

  8. Why is an excess of ammonia or amine utilized when preparing amides from acyl chlorides?

    1. To serve as an oxidizing agent

    2. To neutralize the byproduct HCI and ensure a complete reaction

    3. To decrease the activation energy

    4. To function as an inert solvent

  9. What is considered the most important chemical application of alkanenitriles?

    1. Reduction to amides

    2. Hydrolysis to produce carboxylic acids

    3. Oxidation to nitroalkanes

    4. Dehydration to alkynes

  10. What is the product of the reaction between phenylamine and excess bromine water?

    1. 2-Bromophenylamine

    2. 4-Bromophenylamine

    3. 2,4,6-Tribromophenylamine

    4. Bromobenzene

Q2. Short questions (Attempt any 6 of 8 · 6 × 2 = 12)

  1. Write the balanced equation for the reaction of aniline with bromine water.

  2. Explain why glycine is the only standard amino acid that does not exhibit optical activity.

  3. How does a Zwitterion form internally within an amino acid molecule?

  4. Write the reaction equation for the reduction of N-methylethanamide.

  5. Provide the chemical equation for the preparation of ethanamide from ethanoyl chloride and ammonia.

  6. Define a coupling reaction in organic chemistry

  7. How many water molecules are produced as a byproduct when one mole of nitrobenzene is completely reduced to aniline?

  8. What is zwitterion?

Q3. Long questions (Attempt any 2 of 3 · 2 × 4 = 8)

  1. Explain the acidic and alkaline hydrolysis of alkanenitriles with balanced chemical equations.

  2. Write a note on electrophoresis.

  3. Give two preparation methods of each of the following: i) Primary amines ii) Secondary amines