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Why are boiling points of ethrs lower th...

Why are boiling points of ethrs lower than those of alcohols of comparable molecular masses ?

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The boiling points of ehters are lower than those of alcohols of compareble of comparable molecular masses. For example, the boiling points of isomeric n-bytyl alcohol `(C_(4)H_(9)OH)` and diethyl ether `(C_(2)H_(5)-O-C_(2)H_(5))` are 390 K and 308 K respectively. The large difference in the boiling may be attributed to the following reasons :
(i) O-H bond in alcohol is more polar C-O bond in ether.
(ii) Intermolecular hydrogen bonding is present in the molecules of alcohol while it is almost absent in the ether molecules.
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Explore conceptually related problems

How would you account for the following: (i) Phenol is more acidic than ethanol. (ii) The boiling points of ethers are much lower than those of the alcohols of comparable molar masses. (iii) Why do ethers possess dipole moment?

Why are the boiling points of ethers lower than those of isomeric alcohols ?

Assertion: The boiling points of alcohols are higher than those of hydrocarbons of comparable molecular mass. Reason Alcohols show intramolecular hydrogen bonding.

Carboxylic acid have higher boiling points than aldehydes, ketones and even alcohol of comparable molecular mass. It is due to their

Knowledge Check

  • Assertion: The boiling points of alcohols are higher than those of hydrocarbons of comparable molecular mass. Reason Alcohols show intramolecular hydrogen bonding.

    A
    Assertion and reason both are correct statements and reason is correct explanation for assertion.
    B
    Assertion and reason both are correct statements but reason is not correct explanation for assertion.
    C
    Assertion is correct statement but reason is wrong statement.
    D
    Assertion is wrong statement but reason is correct statement.

  • Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their :

    A
    Formation of intramolecular H-bonding
    B
    Formation of carboxylate ion
    C
    Formation of intermolecular H-bonding
    D
    More extensive association of carboxylic acid via van der Waals force of attraction

  • Assertion (A) : The weak polarity of ethers does not appreciably affect their boiling points which are comparable to those of alkanes of comparable molecular masses. Reason (R) :Miscibility of ethers with water resembles that of alcohols of the same molecular mass.

    A
    Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
    B
    Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanationof the Assertion (A).
    C
    Assertion (A) is correct, but Reason (R) is incorrect statement.
    D
    Assertion (A) is incorrect, but Reason (R) is correct statement.
    • DINESH PUBLICATION-ETHERS-QUESTIONS FROM BOARD EXAMINATIONS
    1. Why are boiling points of ethrs lower than those of alcohols of compar...

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    2. How will you convert anisole to phenol ?

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    3. How do you account for the miscibility of ethoxyethane with water ?

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    4. Describe the mechanism for the formation of diethyl ether from ethanol...

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    5. Complete the following reaction : C(6)H(5)Ona+C(2)H(5)CIrarr

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    6. Write the IUPAC name of the compound : CH(3)-O-CH(2)-underset(CH(3))...

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    7. Write the names of reagents and equations for the preparation of follo...

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    8. State the products of the following reactions (i) CH(3)-CH(2)-CH(2)-...

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    9. Give a brief account of Williamson's synthesis.

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    10. Name the reagent used in the Friedel Craft's alkylation of anisole.

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    11. (CH(3))(3)C-OCH(3) on reaction with HI gives (CH(3))(3)C-I and CH(3)-O...

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    12. (CH(3))(3)C-Br on reaction with sodium methoxide (Na^("+)O^(-)CH(3)) g...

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    13. Complete the following : CH(3)-CH(2)-O-C(6)H(5)+HI("Conc.")rarr

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    14. Anisole on reaction with HI gives phenol and CH(3)-I as the main produ...

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    15. Write chemical equatio involved in Friedel Crafts acetylation of aniso...

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    16. Why is boiling point of n-butyl alcohol (118^(@)C) higher than that of...

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    17. Complete the reaction : CH(3)-underset(CH(3))underset(|)(CH(3))-O-CH...

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