Write equation for the ionization of RCOOH and for Ka and then e
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    Aldehydes, Ketones and Carboxylic Acids

    Multiple Choice QuestionsShort Answer Type

    321.

    Explain the mechanism of aldol condensation using ethanal as an example.

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    322.

    Account for the following:
    Carboxylic acids with five or less carbons are water soluble, but many with six or more carbons dissolves in alcohols.

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    323.

    Account for the following:
    Carboxylic acids exist as dimers in the vapour phase.

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    324. Illustrate the mechanism of reaction of carbonyl group with an ammonia derivative, H2N—Z.
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    325. Account for the fact that the C—O bond in RCOOH is shorter than in ROH ?
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    326. Compare the reactivities of the C = O in RCOOH and RCHO towards nucleophiles.
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    Multiple Choice QuestionsLong Answer Type

    327. Why is benzoic acid a stronger acid than phenol?
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    Multiple Choice QuestionsShort Answer Type

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    328. Write equation for the ionization of RCOOH and for Ka and then explain why RCOOH has a lower pKa value than alcohol.

    Equation for the ionization of RCOOH is,




    RCOOH is a stronger acid and has a lower pKa value than alcohol because RCOO- is more resonance stabilized than RO- ion.


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    329. Account for the following acidic strength order:

    FCH subscript 2 COOH space space space space space greater than space space space space ClCH subscript 2 COOH space space space greater than space space BrCH subscript 2 COOH space space greater than space space ICH subscript 2 COOH space greater than space CH subscript 3 COOH
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    330. Account for the following acidic strength order:

    Cl subscript 3 straight C space COOH greater than space Cl subscript 2 CHCOOH greater than ClCH subscript 2 COOH space greater than CH subscript 3 COOH
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