91Ó°ÊÓ

IUPAC naming is a set of regulations made to assign specific names to organic compounds. Organic chemists have given these rules that help to rectify the substituents and functional groups as per their counts.

The carbon count is stated in the following way:

• Three carbons- Tri
• Fourcarbons-But
• Fivecarbons-Pent
• Sixcarbons- Hex, and so on

The bonds are named as:

• -ane: single bond
• -ene: double bond
• -yne: triple bond

a. The longest carbon chain is the cyclohexane ring, which is calledthe parent chain. Two methyl groups are located at the first position on the cyclohexane ring.

Hence, the IUPAC name is 1,1-dimethylcyclohexane.

b.The longest carbon chain is a five-membered cyclopentane ring, which is called a parent chain. Three methyl groups are located at 1,2,3-positions on the cyclopentane ring.

Hence, the IUPAC name is 1,2,3-trimethylcyclopentane.

c. The number of carbon atoms in the cyclic chain is six, which is the parent chain. Substituents such as the n-butyl group and a methyl group are located at the first and fourth position carbon atoms, respectively.

Hence, the IUPAC name is 1-butyl-4-methylcyclohexane.

d.The longest carbon chain is the cyclohexane ring, which is called the parent chain. A secondary butyl group is located at the first position, and an isopropyl group is located at the second position on the cyclohexane ring.

Hence, the IUPAC name is 1-sec-butyl-2-isopropylcyclohexane.

e. The longest chain is of five carbon-containing pentane chains. A cyclopropane ring is attached as the substituent at the first carbon atom.

Hence, the IUPAC name is 1-cyclopropylpentane.

f. The longest carbon chain is the cyclohexane ring, which is called the parent chain. Abutyl group is located in the third position, and two methyl groups are bonded at the first carbon atom from where the numbering starts.

Hence, the IUPAC name is 3-butyl-1,1-dimethylcyclohexane.