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Question

The IUPAC name of CH2=CH−CH2Cl is

A
3-chloro-1-propene
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B
1-chloro-3-propene
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C
Allyl chloride
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D
Vinyl chloride
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Solution

The correct option is A 3-chloro-1-propene
The correct numbering of the parent chain is 1CH2=2CH3CH2Cl.
Halogens are always used as substituent and is present at 3rd carbon. Also one double bond is present as functional group at first carbon. Since parent chain is of 3 carbon so word root is prop. so the correct IUPAC name is 3-chloro-1-propene.

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