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In pyrole the electron density is maximu...

In pyrole the electron density is maximum on
.

A

`2and3`

B

`3and4`

C

`2and4`

D

`2and5`

Text Solution

Verified by Experts

The correct Answer is:
D
Pyrrole (a very important five membered hetrocyclic) is resonance hydrid
Since resonating structure(III) and (IV) are relatively more stable (due to lasser charge separation) than resonating structures(II) and (V) the electrons density is maximum on `2and5` Hence electrophilic substitution in pyrrole occurs predominantly in the `2-(or5-)` position
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Knowledge Check

  • In phenol , pi -electron-density is maximum on

    A
    ortho and meta positions
    B
    ortho and para positions
    C
    meta and pera positions
    D
    none of these

  • Electron affinity is maximum for

    A
    Cl
    B
    F
    C
    Br
    D
    I

  • Statement : IE_1 for is maximum and EA_1 for Cl is more than EA_1 of (F) . Explanation : He possess paired electrons in 1s subshell , clsest to nucleus , wherease electron density in F is maximum which exers more electron -electron repulsion.

    A
    `S` is correct by ` E` is wrong .
    B
    `S` is wrong but E is wrong .
    C
    Both `S` and `E` are correct and `E` is correct explanation os ` S` .
    D
    Both `S` and ` E` are conrrect and `E` is correct explanation os `S`.

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