substituent. (Rule ) CH | CH −CH−CH −CH −CH Step : All are single bonds between the carbon atoms and thus the suffix is ‘ane’. Step : The substituent is a methyl group and it is located at second carbon atom. So, its locant number is .
Thus the prefix is ‘ -Methyl’. (Rule ). The name of the compound is -Methyl + pent +ane = -Methylpentane Example : CH − CH− CH − CH − CH − CH CH CH − − Step : The longest chain contains seven carbon atoms and hence the root word is ‘Hept’. Step : There is a substituent.
So, the carbon chain is numbered from the end, which is closest to substituent. (Rule ) CH − CH− CH − CH − CH − CH CH CH − − Correct Wrong CH − CH− CH − CH − CH − CH CH CH − − Step : All are single bonds between the carbon atoms and thus the suffix is ‘ane’. Step : The substituent is a methyl group and it is located at third carbon. So, its locant number is .
Thus the prefix is ‘ -Methyl’. (Rule ) Hence the name of the compound is -Methyl + hept + ane = –Methylheptane Example : CH -CH -CH -CH=CH Step : It is a ‘five- carbon atoms chain’ and hence the root word is ‘Pent’. (Rule ) Step : There is a carbon to carbon double bond. The suffix is ‘ene’.
Step : The carbon chain is numbered from the end such that double bond has the lowest locant number as shown below: (Rule ):