Home
Class 12
CHEMISTRY
Assertion: Lower aldehydes and ketonses ...

Assertion: Lower aldehydes and ketonses are solutble in water but the solubility decreases as the molecular mass increase.
Reason : Distinction between aldehydes and letones.

A

If Both assertion and reason are true reason is the correct explation of the assertion.

B

If Both assertion and reason are true but reason is not the correct explation of the assertion.

C

If assertion is true but reason is false.

D

If assertion is false but reason is true.

Text Solution

Verified by Experts

The correct Answer is:
B
Lower aldehydes and ketone are soluble in water due to polar effect of `gtC = O` which makes hydrogen bonds with water molecules. As the size of the aldehydes and ketones increase the hydrophobic part, i.e., alkyl Chain increases which weaknes the `H-bond` foemations with `H_(2)O` molecles and decreases the solubility.
Promotional Banner

Topper's Solved these Questions

  • ALDEHYDES, KETONES AND CARBOXYLIC ACID

    A2Z|Exercise AIPMT/NEET Questions|43 Videos

  • ALDEHYDES, KETONES AND CARBOXYLIC ACID

    A2Z|Exercise AIIMS Questions|40 Videos

  • ALDEHYDES, KETONES AND CARBOXYLIC ACID

    A2Z|Exercise Section A (Topicwise question|3 Videos

  • ALCOHOLS, PHENOLS AND ETHERS

    A2Z|Exercise Section D - Chapter End Test|30 Videos

  • BIOMOLECULES

    A2Z|Exercise Section D - Chapter End Test|30 Videos

Similar Questions

Explore conceptually related problems

(A) Lower aldehydes and ketones are soluble in water but solubility decrease as the molecular masses increase. (R) Distinction between aldehydes and ketones can be made by Tollen's reagent.

If we increase the molecular mass of alcohol , its solubility will

Assertion : Solubility of alcohols in water decreases with the increase in the molecular mass. Reason : The increase in the size of the alkyl group increases the polar nature of O-H group.

Knowledge Check

  • (A) Lower aldehydes and ketones are soluble in water but solubility decrease as the molecular masses increase. (R) Distinction between aldehydes and ketones can be made by Tollen's reagent.

    A
    Both A and R are true and R is the correct explanation of A.
    B
    Both A and R are true but R is not a correct explanation of A
    C
    A is true but R is false
    D
    A is false but R is true

  • Assertion: Lower aldehyde and ketones are soluble in water but the solubility decreases as molecular mass increases. Reason: Aldehydes and ketones can be distinguished by Tollen reagent.

    A
    If both assertion and reason are true and the reason is the correct explanation of the assertion
    B
    If both assertion and reason are true but reason is not the correct explanation of the assertion
    C
    If assertion is true but reason is false
    D
    If the assertion and reason both are false

  • Assertion (A) : Aldehydes are converted into aldols in the presence of concentrated alkali. Reason (R) : Tollen's reagent can distinguish between aldehydes and ketones but Fehling reagent cannot.

    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 explanation of 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
    • A2Z-ALDEHYDES, KETONES AND CARBOXYLIC ACID-Section B - Assertion Reasoning
    1. Assertion: Lower aldehydes and ketonses are solutble in water but the ...

      Text Solution

      |

    2. Assertion: Formic acid reduces mercuric chloride to mercurous chloride...

      Text Solution

      |

    3. Assertion: Boiling and melting point of amides are higher than corresp...

      Text Solution

      |

    4. Assertion: Hydroxyketones are not directly used in Grignard reaction. ...

      Text Solution

      |

    5. Assertion: Isobutanal does not give iodoform test. Reason : It does ...

      Text Solution

      |

    6. Assertion: The pK(a) of acetic acid is lower than that of phenol. R...

      Text Solution

      |

    7. Assertion: Acetamide has more polargt C = 0 group than ethyl acetoacet...

      Text Solution

      |

    8. Assertion: (CH(3))(3)C COC(CH(3))(3) and acetone can be distanguished ...

      Text Solution

      |

    9. Assertion: Cyclohexanone exhibits keto-enol tautomerism. Reason : In...

      Text Solution

      |

    10. Assertion: Benzaldehyde is more reactive than ethanal towards nucleoph...

      Text Solution

      |

    11. Assertion: p-N, N-dimethylaminobenzaldehy under-goes benzoin condensat...

      Text Solution

      |

    12. Assertion: In sodium formate, both the C - O bonds have same value 1.2...

      Text Solution

      |

    13. Assertion: Esters which contain alpha-hydrogens undergo Claisen conden...

      Text Solution

      |

    14. Assertion: beta-Keto carboxylic acids lose CO(2) when heated of about ...

      Text Solution

      |

    15. Assertion: The acetate ion is resonance stablized Reason : Acetate i...

      Text Solution

      |

    16. Assertion: p-hydroxybenzoic acid has a lower boiling point than o-hydr...

      Text Solution

      |

    17. Assertion: Aromatic aldehydes can be distinguished from aliphatic alde...

      Text Solution

      |

    18. Assertion: Paracids are stronger acids than corresponding carboxylic a...

      Text Solution

      |

    19. Assertion: Acerylic acid (CH(2) - CHCOOH) is a weaker acid than benzon...

      Text Solution

      |

    20. Assertion: Acetoacetic ester (CH(3)COCH(2)COOHH(5)) contains CH(3)CO g...

      Text Solution

      |