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How many different isomers (including stereoisomers) of cyclohexane dicarboxylic acid on heating with P2O5 gives cyclic anhydride ?
    Correct answer is '3'. Can you explain this answer?
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    How many different isomers (including stereoisomers) of cyclohexane di...
    Only cis isomers can give cyclic anhydride.
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    Different Isomers of Cyclohexane Dicarboxylic Acid

    There are three different isomers of cyclohexane dicarboxylic acid that can be obtained when it is heated with P2O5 to give a cyclic anhydride. These isomers include cis-cis, cis-trans, and trans-trans isomers.

    Cis-Cis Isomer
    - The cis-cis isomer of cyclohexane dicarboxylic acid has both carboxylic acid groups on the same side of the cyclohexane ring.
    - When heated with P2O5, this isomer undergoes a dehydration reaction, where one molecule of water is eliminated from the molecule, resulting in the formation of a cyclic anhydride.
    - The cyclic anhydride formed from the cis-cis isomer is known as cis-cis cyclohexanedicarboxylic anhydride.

    Cis-Trans Isomer
    - The cis-trans isomer of cyclohexane dicarboxylic acid has one carboxylic acid group on each side of the cyclohexane ring.
    - When heated with P2O5, this isomer also undergoes a dehydration reaction, resulting in the formation of a cyclic anhydride.
    - The cyclic anhydride formed from the cis-trans isomer is known as cis-trans cyclohexanedicarboxylic anhydride.

    Trans-Trans Isomer
    - The trans-trans isomer of cyclohexane dicarboxylic acid also has both carboxylic acid groups on the same side of the cyclohexane ring.
    - When heated with P2O5, this isomer also undergoes a dehydration reaction, resulting in the formation of a cyclic anhydride.
    - The cyclic anhydride formed from the trans-trans isomer is known as trans-trans cyclohexanedicarboxylic anhydride.

    Summary
    In summary, when cyclohexane dicarboxylic acid is heated with P2O5, three different isomers can be obtained, including cis-cis cyclohexanedicarboxylic anhydride, cis-trans cyclohexanedicarboxylic anhydride, and trans-trans cyclohexanedicarboxylic anhydride. These isomers are formed through a dehydration reaction, where water is eliminated from the carboxylic acid groups, resulting in the formation of a cyclic anhydride.
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    How many different isomers (including stereoisomers) of cyclohexane dicarboxylic acid on heating with P2O5 gives cyclic anhydride ?Correct answer is '3'. Can you explain this answer?
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