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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.
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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

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