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Mesomerism is extended resonance. Atoms ...

Mesomerism is extended resonance. Atoms or groups with lone pairs of electrons release electrons when connected to doubly bonded carbons. It is +M effect. Unsaturated groups when connected to doubly bonded carbons withdraw `pi` electrons from the doubly bonded carbons. It is -M effect. Here the double bond is the unsaturated group should be between less electronegative atom and more electronegative atom.

Mesomeric effect stabilizes or destabilizes the conjugate base of an acid. As a result the acid may be strong or weak has 4(OH) groups. Which -OH is a strong acid?

A

S

B

R

C

Q

D

P

Text Solution

Verified by Experts

The correct Answer is:
D
The resulting conjugative base (from P ) is more stable
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Mesomerism is extended resonance. Atoms or groups with lone pairs of electrons release electrons when connected to doubly bonded carbons. It is +M effect. Unsaturated groups when connected to doubly bonded carbons withdraw pi electrons from the doubly bonded carbons. It is -M effect. Here the double bond is the unsaturated group should be between less electronegative atom and more electronegative atom. Which of the following is most stable?

Mesomerism is extended resonance. Atoms or groups with lone pairs of electrons release electrons when connected to doubly bonded carbons. It is +M effect. Unsaturated groups when connected to doubly bonded carbons withdraw pi electrons from the doubly bonded carbons. It is -M effect. Here the double bond is the unsaturated group should be between less electronegative atom and more electronegative atom. Which of the following statements is right?

Knowledge Check

  • Double bonded carbons are involved in

    A
    `sp^(3)` hybridisation
    B
    `sp^(2)` hybridisation
    C
    sp hybridisation
    D
    sp or `sp^(2)orsp^(3)` hybridisation

  • Number of sigma bonds , pi bonds and lone pairs of electrons present in acetone semicarbazone are

    A
    `16, 2,5`
    B
    ` 16,2,2`
    C
    ` 14,2,4`
    D
    ` 16,2,4`

  • The molecules or ions in which the central atom has only bond pairs of electrons are

    A
    `NH_(4)^(+)`
    B
    `NO_(3)^(-)`
    C
    `SnCI_(2)`
    D
    `SF_(4)`

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    In alkanes, the carbon atoms are connected by ___________bonds.

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