91Ó°ÊÓ

It is method to give a scientific name to the organic compounds recommended by the Indian Union of Pure and Applied Chemistry.

IUPAC rules used for naming of cycloalkanes

• Name the parent cycloalkane
• Assign numbering to the substituents
• Assign the first number to the bulky group
• Halogens get the first priority
• Write the name of the molecule in alphabetic

a) The IUPAC name of the compound A is 1,1 dimethyl cyclooctane

1. The parent cycloalkane is cyclooctane
2. The substituent are methyl
3. Position is 1 for both dimethyl
4. Hence, the structure is

b) The IUPAC name of the compound B is 3-cyclobutyl hexane

1. The parent alkane is hexane
2. The substitutent is cyclo-butyl group
3. Position is 3 for cyclo-butyl group
4. Hence, the structure is

c) The IUPAC name of the compound C is 1,2 dichloro cyclopentane

1. The parent alkane is cyclopentane
2. The substituent is chloro
3. Position is 1 for both chloro
4. Hence, the structure is

d) The IUPAC name of the compound D is 1,3 dibromo 5-methyl cyclohexane

1. The parent alkane is cyclohexane
2. The substituent is chloro and methyl
3. Position is 1 and 3 chloro and 5 for methyl
4. Hence, the structure is