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Carboxylic Acids

11 free MDCAT Chemistry MCQs on Carboxylic Acids (PM&DC syllabus), each with the answer, an explanation and the textbook line it comes from. Tap to check, no sign-up.

MDCAT (Pakistan)ChemistryPre-medical (Grade 12)11 questions

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  1. Question 1

    The base hydrolysis of an ester, the type of reaction used to make soap from fats, is called:

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    Answer: D) Saponification

    Latin sapon = soap. Source: Chemistry 12 KPK (taleem360.com), p. 312.

  2. Question 2

    Which of the following is an aromatic carboxylic acid?

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    Answer: A) Benzoic acid

    ArCOOH; phenol and benzyl alcohol have -OH, not -COOH. Source: Chemistry 12 KPK (taleem360.com), p. 302.

  3. Question 3

    Which of these is the strongest acid?

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    Answer: B) Trichloroacetic acid

    pKa 0.65 vs 2.86, 4.76 and 4.87: three electron-withdrawing Cl atoms stabilize the anion most. Source: Chemistry 12 KPK (taleem360.com), p. 299.

  4. Question 4

    Acetic acid can be prepared by the acid hydrolysis of:

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    Answer: C) Methyl cyanide

    The C-N triple bond of a nitrile is hydrolysed to -COOH and ammonium ion. Source: Chemistry 12 KPK (taleem360.com), p. 301.

  5. Question 5

    The acid that can be smelled in rancid butter is:

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    Answer: D) Butyric acid

    Butyric acid is butanoic acid (Latin butyrum = butter). Source: Chemistry 12 KPK (taleem360.com), p. 296.

  6. Question 6

    Carboxylic acids are more acidic than alcohols because in the carboxylate ion the negative charge is:

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    Answer: B) Spread over two oxygen atoms

    In the alkoxide ion the charge stays on one oxygen. Source: Chemistry 12 KPK (taleem360.com), p. 299.

  7. Question 7

    Chloroacetic acid is a stronger acid than acetic acid because chlorine:

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    Answer: C) Is electron withdrawing

    It disperses the negative charge of the carboxylate ion; alkyl groups do the opposite. Source: Chemistry 12 KPK (taleem360.com), p. 299.

  8. Question 8

    Carboxylic acids do not give the addition reactions of aldehydes because their carbonyl carbon is:

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    Answer: D) Less positive

    Electrons from the -OH oxygen reduce the partial positive charge. Source: Chemistry 12 KPK (taleem360.com), p. 303.

  9. Question 9

    Oxidation of toluene with hot KMnO4 gives:

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    Answer: A) Benzoic acid

    The side chain, not the stable aromatic ring, is oxidized to -COOH. Source: Chemistry 12 KPK (taleem360.com), p. 302.

  10. Question 10

    The most reactive carboxylic acid derivatives towards nucleophiles are:

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    Answer: B) Acyl halides

    Order: acyl halides > anhydrides > esters > amides. Source: Chemistry 12 KPK (taleem360.com), p. 304.

  11. Question 11

    Heating sodium acetate with soda lime gives:

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    Answer: C) Methane

    Decarboxylation removes CO2 as Na2CO3. Source: Chemistry 12 KPK (taleem360.com), p. 310.

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