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

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Solution

Rules for Naming Hydrocarbons:-

Rule-I Selection of the longest carbon chain.

Rule-II Numbering the longest chain: Longest chain is numbered starting from a terminal carbon. Numbering is done is such a way that the lowest possible number is given to the side chain or a functional group.

Rule-III Writing names of branched, saturated hydrocarbons, locants are written first in alphabetical order followed by name of parent chain.

Rule-IV Some common names are retained in $I U P A C$ system for unsubstituted hydrocarbon only.
(i) 2-Ethylbutane $⟶$ 2-ethyl-butane
(ii) 4-Methylpentane $⟶$ 4-methyl-pentane
(iii) 3,5-Dimethylhexane $⟶$ 3,5,-dimethyl-hexane
(iv) 5-Ethyl-4-methylheptane $⟶$ 5-ethyl-4-methyl-heptane
(v) 2,3-Dimethyl-3-ethylpentane $⟶$ 3-ethyl-2,3-dimethyl-pentane
(vi) 3-Methyl-4-isopropylheptane $⟶$ 4-isopropyl-3-methyl-heptane
(vii) 4-Ethyl-5-sec-butylnonane $⟶$ 5-sec-butyl-4-ethyl-nonane

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Similar questions

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 the structures of the following organic halogen compounds.

(i)2-Chloro-3-methylpentane

(ii)p-Bromochlorobenzene

(iii)1-Chloro-4-ethylcyclohexane

(iv)2-(2-Chlorophenyl)-1-iodooctane

(v) Perfluorobenzene

(vi)4-tert-Butyl-3-iodoheptane

(vii)1-Bromo-4-sec-butyl-2-methylbenzene

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

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