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Alcohols and phenols

5 Class 12 Chemistry questions with answers and explanations.

Printable worksheet with answer key

All questions with answers

  1. Oxidation of a primary alcohol with acidified dichromate gives first:

    • 1 An ester
    • 2 An alkane
    • 3 A ketone
    • 4 An aldehyde
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    Correct answer: An aldehyde

    Primary alcohols give aldehydes and then carboxylic acids.

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  2. Oxidation of a secondary alcohol gives a:

    • 1 Ketone
    • 2 Alkane
    • 3 Carboxylic acid
    • 4 Aldehyde
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    Correct answer: Ketone

    Secondary alcohols oxidise to ketones.

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  3. Phenol is:

    • 1 Strongly basic
    • 2 Strongly acidic
    • 3 Weakly acidic
    • 4 Neutral
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    Correct answer: Weakly acidic

    Phenol is a weak acid, stronger than alcohols.

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  4. Ethanol and ethanoic acid react in the presence of an acid catalyst to form:

    • 1 An ester
    • 2 An ether
    • 3 An aldehyde
    • 4 An alkene
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    Correct answer: An ester

    This is esterification, giving ethyl ethanoate.

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  5. Methanol is poisonous because it is metabolised to:

    • 1 Water only
    • 2 Ethanol
    • 3 Methanal and methanoic acid
    • 4 Glucose
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    Correct answer: Methanal and methanoic acid

    These products damage the optic nerve and other tissues.

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More Chemistry topics
Periodic classification and periodicity
s and p block elements
Transition elements
Hydrocarbons
Alkyl halides
Aldehydes and ketones
Carboxylic acids
Macromolecules