Number of carbons in selected principal carbon chain for IUPAC nomenclature will be

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Solution

The carbon chain containing both $- C O O H$ groups is the principal chain. So, no. of Carbon atoms in the principal chain are 5. Also, from the figure below, it can be understood.

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Number of carbons in selected principal carbon chain for IUPAC nomenclature will be

The carbon chain containing both −COOH groups is the principal chain. So, no. of Carbon atoms in the principal chain are 5. Also, from the figure below, it can be understood.

The carbon chain containing both $- C O O H$ groups is the principal chain. So, no. of Carbon atoms in the principal chain are 5. Also, from the figure below, it can be understood.