The IUPAC name of the compound $C l - C H_{2} - C H_{2} - C H_{2} - C H_{2} - O H$ is

3-chlorobutanal

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chlorobutan-4-ol

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4-chlorobutan-1-ol

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chlorobutanal

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Solution

The correct option is C 4-chlorobutan-1-ol
$∙$ The given compound has an alcohol group as well as a halogen atom in it. In this case, more preference will be given to alcohol, i.e., numbering starts from carbon atom containing -OH group.

$∙$ The compound will have a prefix '4-chloro' as a chlorine atom is attached to the fourth carbon atom.

$∙$ The primary suffix of the compound is '-an-' as it contains only C-C single bonds.

$∙$ The secondary suffix of the compound will be '-1-ol' as it has an alcohol group attached to the first carbon atom.

$∙$ The word root of the compound will be 'but' as there are four carbon atoms in the parent chain.

Hence, the IUPAC name of the compound $C l - C H_{2} - C H_{2} - C H_{2} - C H_{2} - O H$ is 4-chlorobutan-1-ol.

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C l - C H_{2} - C H_{2} - C H_{2} - C H_{2} - O H

C H_{3} - C H_{2} - O H | C H - C H_{2} - C H_{2} - C H_{2} - C H_{2} - C H_{2} - C H_{2} - C H_{2} - C H_{2} - C H_{3} | C H - C H_{3}

C H_{2} = C H - C H_{2} - C H_{2} - C H | | O - C H_{2} - O H

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