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Question

The number of carbon atoms in the principal chain of the given compound are :
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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 CH3 which will include a CHO group also.

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