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What are the necessary conditions for an...

What are the necessary conditions for any system to be aromatic?

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The necessary conditions for a molecule to be aromatic are : (i)It should have a single cyclic cloud of delocalised `pi`-electrons above and below the plane of the molecule.
(ii)It should be planar . This is because complete delocalization of `pi`-electrons is possible only if the ring is planar to allow cyclic overlap of p-orbials.
(iii)It should contain Huckel number of electrons, i.e., (4n+2) `pi`-electrons where n=0,1,2,3.... etc. A molecule which does not satisfy any one or more of the above conditions is said to be non-aromatic.
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  • What is the necessary condition for rusting of iron?

    A
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    B
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    C
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    B
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    A
    Cold and dark
    B
    presence of halogen carrier
    C
    Both (a) and (b)
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