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Concept explainers
(a)
Interpretation:
The structure of 4-methylhexane has to be drawn and correct name has to be given.
Concept Introduction:
The hydrocarbons which contains only single bonds are said to be
The Alkanes are named following some rules:
- The name of the alkane is given by the number of carbon atoms present in the chain. It is said to be Root of the alkane.
Root = number of carbon atoms in chain.
- To name the root, for one carbon atom, the root name use is meth-. For two carbon atoms, the root name is eth-, for three carbon atoms, it is prop-, for four carbon atoms, it is but-, for five carbon atoms, it is pent- and so on.
- The carbon chain is numbered in a way that the substituents get lowest number possible.
- The root name is followed by Suffix. Suffix indicates the
functional group present in the compound. It is placed after the root name.
Suffix = name of the functional group present in the compound.
- The root name also contains Prefix. Prefix is the groups attached to the root. It indicates the branched carbon atoms on the root chain and name according to the root specifying the carbon number on which it is placed. It contains –yl in name end. The prefix is placed before the root name.
Prefix = name of the branched carbon atoms on chain.
- The name of the alkane is given in the form
Prefix + Root + Suffix
(a)
![Check Mark](/static/check-mark.png)
Explanation of Solution
The given name of the compound is 4-methylhexane.
The structure of 4-methylhexane is given as the six carbon chain with a methyl group as substituent at fourth carbon. The structure will be given as
According to systematic nomenclature, the carbon chain should be numbered in a way that the substituents get lowest number possible. Hence, in hexane six carbons are there in a chain and the methyl group attached to the chain will get third number on the chain. So, the correct name is 3-methylhexane.
The name of the compound based on systematic nomenclature should be 3-methylhexane.
(b)
Interpretation:
The structure of 2-ethylpentane has to be drawn and correct name has to be given.
Concept Introduction:
The hydrocarbons which contains only single bonds are said to be Alkanes. The general formula for alkanes can be given as
The Alkanes are named following some rules:
- The name of the alkane is given by the number of carbon atoms present in the chain. It is said to be Root of the alkane.
Root = number of carbon atoms in chain.
- To name the root, for one carbon atom, the root name use is meth-. For two carbon atoms, the root name is eth-, for three carbon atoms, it is prop-, for four carbon atoms, it is but-, for five carbon atoms, it is pent- and so on.
- The carbon chain is numbered in a way that the substituents get lowest number possible.
- The root name is followed by Suffix. Suffix indicates the functional group present in the compound. It is placed after the root name.
Suffix = name of the functional group present in the compound.
- The root name also contains Prefix. Prefix is the groups attached to the root. It indicates the branched carbon atoms on the root chain and name according to the root specifying the carbon number on which it is placed. It contains –yl in name end. The prefix is placed before the root name.
Prefix = name of the branched carbon atoms on chain.
- The name of the alkane is given in the form
Prefix + Root + Suffix
(b)
![Check Mark](/static/check-mark.png)
Explanation of Solution
The given name of the compound is 2-ethylpentane.
The structure of 2-ethylpentane is given as the five carbon chain with an ethyl group as substituent at second carbon. The structure will be given as
According to systematic nomenclature, the carbon chain should be numbered in a way that the carbon chain should consists of more carbon atoms and substituents get lowest number possible.
In 2-ethylpentane, the carbon chain consists only five carbons with an ethyl group on second carbon. But according to the nomenclature, the carbon chain will be hexane and the substituent group is methyl on third carbon. The correct structure of the compound can be given as
The name of the compound based on systematic nomenclature should be 3-methylhexane.
(c)
Interpretation:
The structure of 2-methylcyclohexane has to be drawn and correct name has to be given.
Concept Introduction:
The hydrocarbons which contains only single bonds are said to be Alkanes. The general formula for cycloalkanes can be given as
The cycloalkanes are named following some rules:
- The name of the cycloalkane is given by the number of carbon atoms present in the ring. It is said to be Root of the cycloalkane.
Root = number of carbon atoms in ring.
- To name the root, for one carbon atom, the root name use is meth-. For two carbon atoms, the root name is eth-, for three carbon atoms, it is prop-, for four carbon atoms, it is but-, for five carbon atoms, it is pent- and so on.
- The carbon ring is numbered in a way that the carbon with substituents get the first number in the ring.
- The root name is followed by Suffix. Suffix indicates the functional group present in the compound. It is placed after the root name.
Suffix = name of the functional group present in the compound.
- The root name also contains Prefix. Prefix is the groups attached to the root. It indicates the branched carbon atoms on the root chain and name according to the root specifying the carbon number on which it is placed. It contains –yl in name end. The prefix is placed before the root name.
Prefix = name of the branched carbon atoms on chain.
- The name of the alkane is given in the form
Prefix + Root + Suffix
(c)
![Check Mark](/static/check-mark.png)
Explanation of Solution
The given name of the compound is 2-methylcyclohexane.
The structure of 2-methylcyclohexane is given as the six carbon ring with a methyl group as substituent at second carbon. The structure will be given as
According to systematic nomenclature, the carbon ring should be numbered in a way that the substituent containing carbon is considered as first carbon.
In 2-methylcyclohexane, methyl group on second carbon. But according to the nomenclature, the carbon with methyl group as substituent will be first carbon in the ring. The correct structure of the compound can be given as
The name of the compound based on systematic nomenclature should be 1-methylcyclohexane. But it is not necessary to mention the number of the substituent on the ring (if only one substituent is present) as it will get the first position. The name of the compound can be given as methylcyclohexane.
(d)
Interpretation:
The structure of 3,3-methyl-4-ethyloctane has to be drawn and correct name has to be given.
Concept Introduction:
The hydrocarbons which contains only single bonds are said to be Alkanes. The general formula for alkanes can be given as
The Alkanes are named following some rules:
- The name of the alkane is given by the number of carbon atoms present in the chain. It is said to be Root of the alkane.
Root = number of carbon atoms in chain.
- To name the root, for one carbon atom, the root name use is meth-. For two carbon atoms, the root name is eth-, for three carbon atoms, it is prop-, for four carbon atoms, it is but-, for five carbon atoms, it is pent- and so on.
- The carbon chain is numbered in a way that the substituents get lowest number possible.
- The root name is followed by Suffix. Suffix indicates the functional group present in the compound. It is placed after the root name.
Suffix = name of the functional group present in the compound.
- The root name also contains Prefix. Prefix is the groups attached to the root. It indicates the branched carbon atoms on the root chain and name according to the root specifying the carbon number on which it is placed. It contains –yl in name end. The prefix is placed before the root name.
Prefix = name of the branched carbon atoms on chain.
- The name of the alkane is given in the form
Prefix + Root + Suffix
(d)
![Check Mark](/static/check-mark.png)
Explanation of Solution
The given name of the compound is 3,3-methyl-4-ethyloctane.
The structure of 3,3-methyl-4-ethyloctane is given as the eight carbon chain with two methyl groups as substituents at third carbon and an ethyl group as substituent at fourth carbon. The structure will be given as
According to systematic nomenclature, the carbon chain should be numbered in a way that the carbon chain should consists of more carbon atoms and substituents get lowest number possible. If two same groups are present as substituents on same carbon atom or different carbon atoms, prefix –di is used to mention the number of groups along with the carbon chain number on which they are present.
The structure of the given compound is correct but the name is wrong. The two methyl groups are present on the same carbon atom in the chain. To mention the number of methyl group’s present prefix –di- has to be added to the methyl.
The name of the compound based on systematic nomenclature should be 3,3-dimethyl-4-ethyloctane.
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Chapter 15 Solutions
Loose Leaf for Chemistry: The Molecular Nature of Matter and Change
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