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Punjab (PTB) · Chapter test · Free

2nd Year Chemistry Chapter 7 TestCARBONYL COMPOUNDS AND CARBOXYLIC ACIDS

30 marks · 40 minutes · 21 questions. Covers: CHAP 23: CARBONYL COMPOUNDS AND CARBOXYLIC ACIDS.

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2nd Year Chemistry Chapter 7 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. During Fehling's test, Cu2+ ions are reduced to which state?

    1. Metallic copper

    2. Cu1+ ions

    3. Cu3+ ions

    4. Complex copper salt

  2. How is HCN gas typically produced during the reaction?

    1. Adding mineral acid to cyanide salt

    2. Oxidation of primary alcohols

    3. Distillation of pure ethanal

    4. Reduction of a ketone

  3. Which monocarboxylic acid uniquely gives a positive Tollens' test?

    1. Methanoic acid

    2. Ethanoic acid

    3. Propanoic acid

    4. Benzoic acid

  4. An electron-withdrawing group has what direct impact on chemical acidity?

    1. Increases acidity

    2. Decreases acidity

    3. Destroys acidity

    4. Keeps it constant

  5. What gas is evolved when ethanoic acid reacts with sodium metal?

    1. Carbon dioxide

    2. Oxygen gas

    3. Hydrogen gas

    4. Ammonia gas

  6. Which of the following compounds gives a positive iodoform test?

    1. Acetone

    2. Methanol

    3. Propanal

    4. Benzophenone

  7. At which position do aldehydes and ketones undergo halogen substitution readily?

    1. Alpha position

    2. Beta position

    3. Gamma position

    4. Carbonyl carbon

  8. What does the H- ion act as during the reduction of carbonyl compounds?

    1. Free radical

    2. Free radical

    3. Electrophile

    4. Nucleophile

  9. Why can the carbonyl double bond easily undergo addition reactions?

    1. The sigma bond is weak

    2. The group is linear

    3. It has high steric hindrance

    4. The pi bond is easily broken

  10. What is the ionization constant (Ka) value of ethanoic acid?

    1. 1.8 × 10-5

    2. 1.8 × 10-4

    3. 1.8 × 10-10

    4. 1.8 × 10-14

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

  1. Describe a test (a different one in each case) that you could use to distinguish between the following pair of compounds: CH2=CH-CH2-OH and CH3CH2CHO

  2. What is the use of benzaldehyde and acetone?

  3. Predict the products of the following reaction, write the chemical equation: Chlorobenzene and ethanol

  4. What is the relation between pKa and acidic strength?

  5. Name the following compound (IUPAC) system: (CH3)3C-CHO

  6. Why do alkane nitriles produce carboxylic acids on hydrolysis?

  7. Why are aldehydes more reactive than ketones towards nucleophiles?

  8. Propanoic acid can be reduced to propan-1-ol by reduction with LiAlH4. Give a balanced chemical equation. Can we use NaBH4 for this reaction? If not, give reason.

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

  1. Define carboxylic acids and explain their important physical properties.

  2. Explain the nucleophilic addition reactions of carbonyl compounds with HCN, hydride ion (H-), and 2,4-dinitrophenylhydrazine.

  3. Give the mechanisms of the reactions of carbonyl compounds with: (i) HCN (ii) NaBH4