The IUPAC name of the given compound is

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Standard X

Chemistry

Nomenclature of Hydrocarbons with More Than One Branch

The IUPAC nam...

Question

4- ethyl- 5- methylheptane

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4- ethyl- 3- methylheptane

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2, 3- diethylhexane

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2- butylhexane

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Solution

The correct option is B
4- ethyl- 3- methylheptane

Let us begin by numbering the longest chain. According to the IUPAC rules of nomenclature the longest chain should be considered as the main chain. No matter which outer carbon we start with, the longest chain is 7 carbons long.

If more than one branch is present, as per rule, numbering should be done either from left to right or right to left so as to get the lowest number for the branch coming first in the longest chain. One methyl substituent is at carbon number 3 and one ethyl substituent is at carbon number 4. Hence, the name is 4- ethyl- 3- methylheptane

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Similar questions

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.

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

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) 3-Chloromethylpentan-1-ol.

Write structures of the following compounds:

(i) 2-Chloro-3-methylpentane

(ii) 1-Chloro-4-ethylcyclohexane

(iii) 4-tert. Butyl-3-iodoheptane

(iv) 1,4-Dibromobut-2-ene

(v) 1-Bromo-4-sec. butyl-2-methylbenzene

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