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IUPAC name of the given structures are:

A.(i) hexane, (ii) 3-methylbutane

B.(i) isopentane, (ii) 2,2-dimethylbutane

C.(i) 3-ethylbutane, (ii) isopentane

D.(i) 3-methylpentane, (Ii) 2-methylbutane

Try solving this question selecting the main chain, numbering it and choosing the root word. The main chain is the one with the greatest number of carbons. Numbering in IUPAC is done such that the branched atom gets the lowest number.

Complete step by step answer:

Let us start naming the organic compound according to the rules of IUPAC nomenclature –

For compound (i) –

Let us number the given compound.

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CBSE

Chemistry

Grade 11

The IUPAC System of Nomenclature

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IUPAC name of the given structures are:

A.(i) hexane, (ii) 3-methylbutane

B.(i) isopentane, (ii) 2,2-dimethylbutane

C.(i) 3-ethylbutane, (ii) isopentane

D.(i) 3-methylpentane, (Ii) 2-methylbutane

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Hint:

Try solving this question selecting the main chain, numbering it and choosing the root word. The main chain is the one with the greatest number of carbons. Numbering in IUPAC is done such that the branched atom gets the lowest number.

Complete step by step answer:

Let us start naming the organic compound according to the rules of IUPAC nomenclature –

For compound (i) –

Let us number the given compound.

As we can see, there are a total of 5 carbon atoms. So, the root word will be ‘pent’.

This compound only has single bonds. So, it is an alkane. The name now becomes ‘pentane’.

As we can see, there is a carbon we haven’t included. This is also known as an alkyl group. Therefore, we will add it in prefix. Since it is attached to carbon-3, the prefix will be ‘3-methyl’.

The name of the compound is – ‘3-methylpentane’

For compound (ii) –

Let us number the given compound.