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Assertion : Simple carbanions are usuall...

Assertion : Simple carbanions are usually pyramidal but allyl carbanion is a planar species.
Reason : All the carbon atoms in allyl carbanion are `sp^(2)`-hybridized.

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:
B
Allyl carbanion is stabilized by resonance.
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Assertion : Benzaldehyde is less reactive than ethanal towards nucleophilic attack. Reason : All the carbon atoms of benzaldehyde 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.

Knowledge Check

  • Statement 1 : Simple carbanions are usually pyramidal but allyl carbanion is a planar species. Statement 2 : All the carbon atoms in allyl carbanion are sp’-hybridized.

    A
    Statement 1 is True, statement 2 is True, Statement 2 is Correct explanation for Statement 1.
    B
    Statement 1 is True, Statement 2 is True, Statement 2 is NOT a correct explanation for Statement 1.
    C
    Statement 1 is True, Statement 2 is False.
    D
    Statement 1 is False, Statement 2 is True.

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

    A
    1, 3-butadiene
    B
    `CH_(2)=C=CH_(2)`
    C
    cyclohexane
    D
    2-butene

  • Assertion : Ethene as well as benzene are planar molecules. Reason : All the carbon atoms in ethene as well as benzene are sp^2 hybridized.

    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 .

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    Assertion : tert-Butyl carbanion is more stable than methyl carbanion. Reason : The +I effect of the three methyl groups in tert-butyl carbanion tends to make it more stable than methyl carbanion.

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