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The Huckel rule for aromaticity connects...

The Huckel rule for aromaticity connects aromatic stability (High delocalization energy or high resonance energy) with the presence of ____`pi` electrons in a closed shell.

A

`(4n)`

B

`4n+1`

C

`(4n+2)`

D

`(4n+3)`

Text Solution

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The correct Answer is:
3
Huckel's rule applies to flat carbocyclic species where each C in the ring is capable of providing a p orbital for extended `pi` bonding. In order to be aromatic, such a species must have `(4n+2)pi` delocalized electrons, where n equals zero or a whole number.
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Knowledge Check

  • Which of the following has high resonance energy than

    A
    B
    C
    D

  • In Huckel's (4n+2)pi rule for aromaticity, 'n' represents

    A
    Number of carbons atoms
    B
    Number of rings
    C
    Whole number
    D
    Fractional number (or) integer (or) zero

  • Crystal field stabilization energy for high spin d^(4) octahedral complex is

    A
    `-0.6 Delta_(0)`
    B
    `-1.8 Delta_(0)`
    C
    `-1.6 Delta_(0) + P`
    D
    `-1.2 Delta_(0)`

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    Type of anios in which delocatisation of negative charge occrur on more electronegative atom are highly stabilized. If negative charge deloclisation occur on same element then stability is decided by number of resonaating sturcture. Cyclic anions which are aromatic are highly stabilized but if cyclic anions are antiaromatic, they are highly destabise due to presence of unpaired electrons in antibonding molecular orbital. Which of the following anions is highly stabilized?

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