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Carboxylic acids do not give the.charact...

Carboxylic acids do not give the.characteristic reactions of carbonyl group. Explain.

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Assertion : Carboxylic acids contain a carbonyl group but do not give characteristic reaction of the carbonyl group. Reason : The electrophilicity of the carbonyl carbon is more in carbocylic acids than in aldehydes and ketones.

Aldehydes, Ketones and Carboxylic acids are Carbonyl compounds.Write the reactions of carboxylic acid with the following reagents. (Write the chemical equations). Chlorine in presence of small amount of red phosphorous.

Knowledge Check

  • Acids do not give the characteristic reaction of (C=0) group because of

    A
    Dimerisation
    B
    Resonance
    C
    Cyclic structures
    D
    Attached alkyl radical

  • Carboxylic acid group does not give the usual addition and elimination reactions of aldehydes and ketones because

    A
    O-H bond is more polar than `""_("/")^("\")C=O` group
    B
    carboxylate ion gets ionised
    C
    carboxylate ion gets stabilised by resonance
    D
    it exists as-COOH and there is no carbonyl group

  • Statement 1 : Carboxylic acids (R-overset(O)overset(||)C-OH) have a carbonyl group but it does not give the test of carbonyl group. Statement 2 : Due to resonance, the double bond character of group is greatly reduced

    A
    Statement 1 is True, statement 2 is True, Statement 2 is Correct explanation for Statement 1.
    B
    Statement 1 is True, Statement 2 is True, Statement 2 is NOT a correct explanation for Statement 1.
    C
    Statement 1 is True, Statement 2 is False.
    D
    Statement 1 is False, Statement 2 is True.

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    Which of the following statements regarding carbonyl group is not correct? The carbon atom of the carbonyl group in aldehydes and ketones is sp^(2) hybridised, The carbon atom of the carbonyl group in the transition state formed during the addition reaction across it sp^(3) hybridised, An aryl group stabilizes an aldehyde more than the transition state, The aryl group in aromatic aldehydes speeds up the addition reaction across the carbonyl group

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    In the Cannizzaro reaction 2 Ph+CHO overset(overset(Θ)OH) rarr Ph-CH_2 OH+PhCOO the slowest step is : the attack of -OH at the carbonyl group, the transfer of hydride ion to the carboxylic acid, the abstraction of proton from the carboxylic acid, the deprotonation of the Ph CH_2 OH

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