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Dicarboxylic acids
The acids consisting of two carboxylic groups are known as dicarboxylic acids.
The saturated dicarboxylic acid are denoted by the general formula 2n (COOH)2 in which n = 0, 1, 2, 3 etc.
As per to IUPAC system, the suffix-dioic acid is added to the name of parent alkane, that is Alkane dioxic acid.
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Delocalisation of electrons in conjugated system is called resonance. For example there is delocalisation of electrons in benzene ,hence we write kekule structure for benzen.
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