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IUPAC System of Nomenclature

The number of...

Question

The number of carbon atoms in the principal chain of the given compound are :

A

7

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B

5

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C

4

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D

6

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Solution

The correct option is B $5$
The number of carbon atoms in the principal chain of the given compound is five because the aldehyde group (here act as a substituent) and double bond has to be given the lowest number. Therefore, the numbering will start from the COOH group and ends in $C H_{3}$ which will include a $C H O$ group also.

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