What is the name of the following compound?

2-Ethylbutan-1-ol

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2-Methylpentan-1-ol

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2-Ethylpentan-1-ol

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3-Ethylbutan-4-ol

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Solution

The correct option is A 2-Ethylbutan-1-ol
$∙$ The IUPAC nomenclature is done by determining the main carbon chain which contains the most active functional group.
$∙$ The longest hydrocarbon chain in the given compound consists of five carbon atoms, but it is not the main chain because it does not contain the functional group (-OH). The other carbon chain consists of four carbon atoms with -OH group. The carbon attached to the -OH functional group is labeled as 1.
$∙$ It is a saturated carbon chain, hence the word root with suffix is butanol. An alkyl group attached to the second carbon atom is 'ethyl' group. Therefore, the correct nomenclature is 2-Ethylbutan-1-ol.

The name 3-ethylbutan-4-ol is not possible because the labeling of the carbon atoms is done with the carbon atom having the highest functional group is given the label 1.

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Similar questions

Q. The IUPAC name of

(C_{2} H_{5})_{2} {CHCH}_{2} OH

is ____________.

Q. Write structures of the compounds whose IUPAC names are as follows:
(i) 2-Methylbutan-2-ol (ii) 1-Phenylpropan-2-ol
(iii) 3,5-Dimethylhexane 1, 3, 5-triol (iv) 2,3 Diethylphenol
(v) 1 Ethoxypropane (vi) 2-Ethoxy-3-methylpentane
(vii) Cyclohexylmethanol (viii) 3-Cyclohexylpentan-3-ol
(ix) Cyclopent-3-en-1-ol (x) 4-Chloro-3-ethylbutan-1-ol.

Q. Following alkanes are wrongly named. Write their correct IUPAC names
(i) 2-Ethylbutane (ii) 4-Methylpentane (iii) 3,5-Dimethylhexane (iv) 5-Ethyl-4-methylheptane (v) 2,3-Dimethyl-3-ethylpentane (vi) 3-Methyl-4-isopropylheptane (vii) 4-Ethyl-5-sec-butylnonane

Which of the following represents the correct IUPAC name for the compounds concerned?

2, 2-Dimethylpentane or 2-Dimethylpentane

2,4,7- Trimethyloctane or 2,5,7- Trimethyloctance

2-Chloro-4-methylpentane or 4-Chloro-2-methylpentane

But-3-yn-1-ol or But-4-ol-1-yne

Which of the following represents the correct IUPAC name for the compounds concerned? (a) 2,2-Dimethylpentane or 2-Dimethylpentane (b) 2,4,7-Trimethyloctane or 2,5,7-Trimethyloctane (c) 2-Chloro-4-methylpentane or 4-Chloro-2-methylpentane (d) But-3-yn-1-ol or But-4-ol-1-yne

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