91Ó°ÊÓ

IUPAC rules used for naming of Alkyl halides

• Select longest carbon chain, it is the parent chain;
• Longest chain must contain double or triple bond, if present;
• Number the alkyl or halo substituent carbon i.e. it should possess lowest number in the parent chain;
• Assign a number to each substituent;
• Write the name of substituent’s in alphabetical order while naming;

(b)The name of the compound is1-Chloro-3-Methylbutane.

As the chemical structure indicates, that the given alkyl halide has four carbon atoms in the parent chain, so it is termed as butane.

It is having two substituents i.e. methyl group and Chloro group, so they will be assigned position alphabetically.

The chloro group is positioned on number 1 and methyl on number 3 carbon. Thus, the given compound is 1-Chloro-3-Methylbutane.

Nomenclature of compound (b)