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For a compound to be aromatic it must ha...

For a compound to be aromatic it must have `(4n + 2) pi` electrons.

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### Step-by-Step Solution: 1. **Understanding Aromatic Compounds**: Aromatic compounds are a special class of cyclic compounds that have unique stability and reactivity due to their electronic structure. 2. **Hückel's Rule**: For a compound to be classified as aromatic, it must satisfy Hückel's rule, which states that the compound must have `(4n + 2)` π (pi) electrons, where `n` is a non-negative integer (0, 1, 2, ...). This means that the total number of π electrons in the cyclic, planar structure must equal 2, 6, 10, 14, etc. 3. **Planarity**: The molecule must be planar, meaning all the atoms in the ring must lie in the same plane. This allows for effective overlap of p-orbitals, which is essential for delocalization of π electrons. 4. **Conjugation**: The compound must exhibit conjugation, which means there should be alternating single and double bonds in the ring structure. This alternation allows for the delocalization of π electrons across the entire molecule. 5. **Conclusion**: To summarize, for a compound to be aromatic, it must meet the following conditions: - It must be cyclic. - It must be planar. - It must have conjugation (alternating double bonds). - It must follow Hückel's rule of having `(4n + 2)` π electrons.
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We have now learned that benzene is unsually stable, and that this stability seems to be correlated with the overlap of its carbon 2p orbitals to form pi molecular orbitals. In 1931. Erich Huckel (1896 - 1980), a German chemist physicist, elucidated with molecular orbital arguments the criteria for this sort of stability, which has come to be called aromaticity. Criteria for aromaticity : * Aromatic compounds contain one or more rings that have a cyclic arragement of p-orbitals. Thus, aromaticity is a property of certain cyclic compounds. * Every atom of an aromatic ring has a p-orbital. * Aromatic rings are planar. The cyclic arrangements of p-orbitals in an aromatic compound must contain 4n+2pi electrons, where n is any positive integer (0, 1, 2, ....). In other words, an aromatic ring must contain 2, 6, 10 pi electrons. Which of the following compound is non-aromatic ?

We have now learned that benzene is unsually stable, and that this stability seems to be correlated with the overlap of its carbon 2p orbitals to form pi molecular orbitals. In 1931. Erich Huckel (1896 - 1980), a German chemist physicist, elucidated with molecular orbital arguments the criteria for this sort of stability, which has come to be called aromaticity. Criteria for aromaticity : * Aromatic compounds contain one or more rings that have a cyclic arragement of p-orbitals. Thus, aromaticity is a property of certain cyclic compounds. * Every atom of an aromatic ring has a p-orbital. * Aromatic rings are planar. The cyclic arrangements of p-orbitals in an aromatic compound must contain 4n+2pi electrons, where n is any positive integer (0, 1, 2, ....). In other words, an aromatic ring must contain 2, 6, 10 pi electrons. Compare the rate of reaction of the following with AgNO_(3) .

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  • We have now learned that benzene is unsually stable, and that this stability seems to be correlated with the overlap of its carbon 2p orbitals to form pi molecular orbitals. In 1931. Erich Huckel (1896 - 1980), a German chemist physicist, elucidated with molecular orbital arguments the criteria for this sort of stability, which has come to be called aromaticity. Criteria for aromaticity : * Aromatic compounds contain one or more rings that have a cyclic arragement of p-orbitals. Thus, aromaticity is a property of certain cyclic compounds. * Every atom of an aromatic ring has a p-orbital. * Aromatic rings are planar. The cyclic arrangements of p-orbitals in an aromatic compound must contain 4n+2pi electrons, where n is any positive integer (0, 1, 2, ....). In other words, an aromatic ring must contain 2, 6, 10 pi electrons. Which of the following compound is not anti-aromatic ?

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    B
    C
    D

  • We have now learned that benzene is unsually stable, and that this stability seems to be correlated with the overlap of its carbon 2p orbitals to form pi molecular orbitals. In 1931. Erich Huckel (1896 - 1980), a German chemist physicist, elucidated with molecular orbital arguments the criteria for this sort of stability, which has come to be called aromaticity. Criteria for aromaticity : * Aromatic compounds contain one or more rings that have a cyclic arragement of p-orbitals. Thus, aromaticity is a property of certain cyclic compounds. * Every atom of an aromatic ring has a p-orbital. * Aromatic rings are planar. The cyclic arrangements of p-orbitals in an aromatic compound must contain 4n+2pi electrons, where n is any positive integer (0, 1, 2, ....). In other words, an aromatic ring must contain 2, 6, 10 pi electrons. Which of the following compound is non-aromatic ?

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    B
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    D

  • We have now learned that benzene is unsually stable, and that this stability seems to be correlated with the overlap of its carbon 2p orbitals to form pi molecular orbitals. In 1931. Erich Huckel (1896 - 1980), a German chemist physicist, elucidated with molecular orbital arguments the criteria for this sort of stability, which has come to be called aromaticity. Criteria for aromaticity : * Aromatic compounds contain one or more rings that have a cyclic arragement of p-orbitals. Thus, aromaticity is a property of certain cyclic compounds. * Every atom of an aromatic ring has a p-orbital. * Aromatic rings are planar. The cyclic arrangements of p-orbitals in an aromatic compound must contain 4n+2pi electrons, where n is any positive integer (0, 1, 2, ....). In other words, an aromatic ring must contain 2, 6, 10 pi electrons. Which of the following compound is not anti-aromatic ?

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    B
    C
    D

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    We have now learned that benzene is unsually stable, and that this stability seems to be correlated with the overlap of its carbon 2p orbitals to form pi molecular orbitals. In 1931. Erich Huckel (1896 - 1980), a German chemist physicist, elucidated with molecular orbital arguments the criteria for this sort of stability, which has come to be called aromaticity. Criteria for aromaticity : * Aromatic compounds contain one or more rings that have a cyclic arragement of p-orbitals. Thus, aromaticity is a property of certain cyclic compounds. * Every atom of an aromatic ring has a p-orbital. * Aromatic rings are planar. The cyclic arrangements of p-orbitals in an aromatic compound must contain 4n+2pi electrons, where n is any positive integer (0, 1, 2, ....). In other words, an aromatic ring must contain 2, 6, 10 pi electrons. Compare the rate of reaction of the following with AgNO_(3) .

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