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Assertion (A) Benzaldehyde is less react...

Assertion (A) Benzaldehyde is less reactive in comparison to ethonal towards nucleophilic attack.
Reason (R ) All the carbon atoms of benzaldehyde are `sp^(2)` - hybridised.

A

if both assertion and reson 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 of the assertion.

C

if assertion is true, but reason is false.

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
B
Correct explanation: Due to electron donating effect of the benzene ring, the carbonyl carbon of benzaldehyde is less electrophilic.
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Knowledge Check

  • Assertion (A): Benzaldehyde is less reactive than ethanal towards nucleophilic addition reactions. Reason (R): Ethanal is more sterically hindered.

    A
    Both A and Rare true and R is the correct explanation of A
    B
    Both A and R are true but R is NOT the correct explanation of A
    C
    A is true but R is false
    D
    A is false and R is true

  • All carbon atoms are sp^(2) -hybridised in:

    A
    `HC-=C-C-=CH`
    B
    `H_(2)C=C=CH_(2)`
    C
    2-butene
    D
    1,3-butadine

  • All carbon atoms are sp^(2) hybridised in

    A
    `CH_(2)=C=CH_(2)`
    B
    1, 3- butadiene
    C
    `CH-=C-C-=CH`
    D
    Cyclohexane

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    In CH_2 = C = CH_2 , all the carbon atoms are sp^2 hybridised.

    Assertion : All the carbon atoms of but-2-ene lie in one plane. Reason : All the carbon atoms in but-2-ene are sp^(2) -hybridized.

    Assertion: Benzaldehyde is more reactive than ethanal towards nucleophilic attact. Reason : The overall effect of- l and +R effect of phenyl group decrease the electron density on the carbon atom of gtC = O group in benzaldehyde.

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