Ncert Exercises & Solutions

The correct IUPAC name for the following compound is:
\(\mathrm{CH}_3-\mathrm{CH}-\mathrm{CH}_2-\mathrm{Br}\\~~~~~~~~~~~~~~|\\~~~~~~~~~~~~~C_2H_5\)

1. 1-bromo-2-ethylpropane
2. 1-bromo-2-ethyl-2-methylethane
3. 1-bromo-2-methylbutane
4. 2-methy!-1-bromobutane

(3) The correct IUPAC name of the given compound is

Identify the longest carbon chain: The compound has a chain of four carbon atoms. Therefore, the parent chain is butane.
Identify and number the substituents:
- Bromine is attached to the first carbon atom. (Number the carbon chain from the end that gives the bromine the lowest possible number.)
- The methyl group is attached to the second carbon atom.
Assign prefixes and position numbers:
- The bromine atom attached to the first carbon is indicated by the prefix "1-bromo".
- The ethyl group attached to the third carbon is indicated by the prefix "2- methyl".
Combine the parts to form the IUPAC name: Combine the prefixes alphabetically, followed by the word root for the longest carbon chain and the suffix for the alkane.

The correct IUPAC name for the given compound is 1-bromo-2-methyl butane.