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Introduction

The IUPAC nam...

Question

The IUPAC name of the compound
$C H_{2} = C H - C H (C H_{3})_{2}$ is

A

1,1-dimethyl-2-propene

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B

3-methyl-1-butene

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C

2-vinylpropane

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D

1-isopropylethylene

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Solution

The correct option is B 3-methyl-1-butene
The functional group in the given compound is alkene, so numbering must be done where double bond gets lowest locant.
Suffix used for alkene is ene.
Methyl group is present at 3rd carbon as a substituent. The parent chain is of four carbon, so the word root will be but. Thus the correct IUPAC name is 3-methyl-1-butene.

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I U P A C

name of the following structure

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