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Why do carboxylic acids have higher boil...

Why do carboxylic acids have higher boiling points than alcohol aof comparable molecular mass?

Text Solution

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Carboxylic acids exists as dimers due to greater intermolecular hydrogen bonding compared to alcohols. Therefore, they boil at a higher temperature than alcohols.
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Explain giving reasons each of the following : (i) Chloroacetic acid has lower pK_(a) value than acetic acid (ii) Carboxylic acids have higher boiling points than alcohols of comparable molecular masses (iii) Electrophilic substiution in benzoic acid takes place at the meta position.

Why do alcohols have higher boiling points thann haloalkanes of comparable molecular mass?

Knowledge Check

  • Statement 1 : Carboxylic acids have higher boiling points than alkanes of nearly same molecular weight. Statement 2 : Carboxylic acids involve hydrogen bonding.

    A
    Statement I is true, statement -2 is true: statement -2 is a correct explanation for statement -2
    B
    Statement -1 is true, Statement -2 is True , Statement-2 is NOT a correct explanation for statement -2
    C
    Statement -1 is true, Statement-2 is false,
    D
    Statement -1 is false, Statement -2 is true.

  • Alcohols have lower boiling points than carboxylic acids of comparable molecular mass because

    A
    carboxylic acids show resonance but alcohols do not
    B
    carboxylic acids form intermolecular bonds but alcohols do not
    C
    intermolecular hydrogen bonding in carboxylic acids is stronger than that in alcohols
    D
    alcohols form intermolecular hydrogen bonds but carboxylic acids do not

  • Assertion: Alcohols have higher boiling points than ethers of comparable molecular masses. Reason: Alcohols and ethers are isomeric in nature.

    A
    If both assertion and reason are true, and reason is the true explanation of the assertion.
    B
    If both assertion and reason are true, but reason is not the true explanation o the assertion.
    C
    if assertion is true, but reason is false.
    D
    If both assertion and reason are false.

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    Explore conceptually related problems

    Assertion(A) In alcohols, the boiling point decreases with decrease in the branching of the carbon chain. Reason(R ) Alcohols have higher boiling point than haloalkanes of comparable molecular mass.

    Why HF has higher boiling point than HCl ?

    Why do alcohols have higher boiling points than haloalkanes of the same molecular mass?

    Carboxylic acids have higher boiling points than those of ethers .Give reason.

    Assertion: Alcohols have higher boiling points than ethers of comparable molecular masses. Reason: Alcohols and ethers are isomerism in nature.

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