Home
Class 12
CHEMISTRY
Assertion : Carbon oxygen bond length of...

Assertion : Carbon oxygen bond length of phenol is slightly less than that in methanol.
Reason : There exist a partial double bond character and carbon to which oxygen is attached in phenol is `sp^2` hybridised.

A

If both (A) and (R) are correct and (R) is the correct explanation of (A).

B

If both (A) and (R) are correct, but (R) is not the correct explanation of (A)

C

If (A) is correct, but (R) is incorrect

D

If both (A) and (R) are incorrect.

Text Solution

Verified by Experts

The correct Answer is:
A

In phenols, the -OH group is attached to `sp^2` hybridised carbon atom of an aromatic ring. The carbon oxygen bond length (136 pm in phenol is slightly less than in methanol. This is due to (i) partial double bond character on account of the conjugation of unshared electron pair of oxygen with the aromatic ring (ii) `sp^2` hybridised state of carbon to which oxygen is attached.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • ALCOHOL, PHENOL & ETHER

    BRILLIANT PUBLICATION|Exercise LEVEL II |100 Videos
  • ALCOHOL PHENOL AND ETHERS

    BRILLIANT PUBLICATION|Exercise LEVEL-II |40 Videos
  • ALCOHOLS, PHENOLS AND ETHERS

    BRILLIANT PUBLICATION|Exercise LEVEL III (Linked Comprehension Type) |12 Videos

Similar Questions

Explore conceptually related problems

Assertion : Aryl halides undergo nucleophilic substitution with ease Reason : Carbon-halogen bond in aryl halides has partial double bond character.

Assertion: The bond angle in alcohols is slightly less than the tetrahedral angle. Reason: In alcohols, the oxygen.of -OH group is attached to carbon by a sigma bond formed by the overlap of a sp^3 hybridised orbital of carbon with sp^3 hybridised orbital of oxygen.

Knowledge Check

  • Assertion : The O-O bond length in H_2O_2 is shorter than that of O_2F_2 Reason : H_2O_2 is an ionic compound.

    A
    If both Assertion and Reason are correct and Reason is the correct explanation of Assertion
    B
    If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion
    C
    If Assertion is correct , but Reason is incorrect
    D
    If both Assertion and Reason are incorrect
  • Assertion: Dipolemoment ofphenol is smaller than that of methanol. Reason: In phenol C-O bond is less polar due to electron withdrawing effect of the benzene ring whereas in methanol, C-O bond Is more polar due to electron releasing effect of CH_3 group.

    A
    A. Both assertion and reason is true R is the correct expanation for A
    B
    B.Both A and R is true but R is not the explanation of A
    C
    C. Assertion is true but reason is false
    D
    D both A and R are false
  • Assertion : C-H bond in ethyne is shorter than C-H bonds in ethene. Reason : Carbon atom in ethene is sp hybridised while it is sp^3 in ethyne.

    A
    If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
    B
    If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
    C
    If Assertion is correct , but Reason is incorrect.
    D
    If both Assertion and Reason are incorrect .
  • Similar Questions

    Explore conceptually related problems

    Assertion: The bond angle in alcohols is slightlyless than the tetrahedral angle. Reason: In alcohols, the oxygen.of die -OH group is attached to carbon bya sigma bond formed by the overlap of a sp^3 hybridised orbital of carbon with sp^3 hybridised orbital of oxygen.

    Assertion: Dipolemoment ofphenol is smaller than that of methanol. Reason: In phenol C-O bond is less polar due to electron withdrawing effect of the benzene ring whereas in methanol, C-O bond Is more polar due to +I effect of CH_3 group.

    The bond angle in C-O-H alcohol Is slightly less than tetrahedral angle:- what is the bond angle C-O-H in phenol? And give the reason for the variation.

    Assertion : HOF bond angle is higher than HOCI bond angle in HOX. 'Reason : Oxygen is more electronegative than halogens.

    Assertion : Hybridisation influences the bond length and bond enthalpy in organic compounds. Reason : More the 's' character of hybrid orbital, shorter and stronger will be the bond.