What is the IUPAC name of the following compound.
$C H_{3} - C H (C H_{3}) - C H (C H_{3}) - C H_{2} - C H_{3}$

3,4-dimethylpentane

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2,3-dimethylpentane

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2 ethyl-3-methylbutane

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3-ethyl-2-methylbutane

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Solution

The correct option is B 2,3-dimethylpentane
The compound contain single bonds only, thus it is alkane. There are two methyl group substituted to the parent carbon chain containing 5 carbon atoms. The numbering will takes place from the side where the methyl group gets least numbering. Thus numbering will takes place from left to right. Thus, the IUPAC name of the compound can be given as follow:
2,3-dimethylpentane

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The IUPAC name of the following compound is?

$C H_{3} - C H_{3} - C H (C H_{2} - C H_{3}) - C H_{2} - C H (C H_{3}) - C H_{3}$

C H_{2} = C H - C H_{3} - C H (C H_{3}) - C H_{3}

C H_{3} - C H (C H_{3}) - C H (C H_{3}) - C H = C H - C H_{2} - C H O

C H_{3} - C H_{2} - C H_{2} - C H (C H_{3}) - C H_{3}

C H_{3} - C H (C H_{2} - C H_{3}) - C H_{2} - C H_{2} - C H_{3}

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