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Huckel's Rule of Aromaticity

Cyclic planar...

Question

Cyclic planar compounds with a conjugated system of 4n $π$ electrons is aromatic.

A

True

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B

False

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Solution

The correct option is B False
According to Huckel Rule,

A cyclic planar compound with a conjugated system of 4 $n π$ electrons is anti-aromatic.
A cyclic planar compound with a conjugated system of 4n $+$ 2 $π$ electrons is aromatic.
Hence, the given statement is $false$

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Similar questions

Q. Which of the following represents a number of

π

electrons in a conjugated system?

Q. On the basis of molecular orbital treatment of various aromatic compounds, it has been observed that an aromatic compound must fulfill the following theoretical requirements. a) It must have an uninterrupted cyclic cloud of

π

-electrons above and below the plane of the molecule ( often called as

π

- cloud). Let us look what does this mean?
i) For the

π

-cloud to be cyclic, the molecule must be cyclic
ii) For the

π

-cloud to be uninterrupted, every atom in the ring must have a p- orbital
iii) For the

π

-cloud to be formed, each p-orbital must be able to overlap with the

p -

orbitals on either side of it. Therefore, the
molecule must be planar. b) The

π

-cloud must contain an odd number of pair of

π

(4 n + 2) π

-electrons, where n is an integer. The stability order of the three compounds is:

Q. On the basis of molecular orbital treatment of various aromatic compounds , it has been observed that an aromatic compound must fulfil the following theoretical requirements.a) It must have an uninterrupted cyclic cloud of

π

- electrons above and below the plane of the molecule ( often called as

π

- cloud). Let us look what does this mean?
i) For the

π

- cloud to be cyclic, the molecule must be cyclic.
ii) For the

π

- cloud to be uninterrupted, every atom in the ring must have a p- orbital. iii) For the

π

-cloud to be formed ,each porbital must be able to overlap with the p-orbitals on either side of it. Therefore, the molecule must be planar .
b) The

π

- cloud must contain and odd number of pair of

π

(4 n + 2) π

- electrons, where n is an integer.
Cyclo- octatetraene is:

The number of $^{'} π^{'}$ - electrons which can not offer aromatic character to a cyclic compound is

For the given compound, number of

π

electrons that take part in conjugation is/are

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