Question

Name the following cycloalkanes:

b. Name the following cycloalkanes:

Short answer

The name of the compound is $1-Ethyl-3-methylcyclopentane$

The name of the compound is $1,1,4-trimethylcyclohexane$

Step-by-step solution

Cis and Trans configuration.

Cis configuration is when two groups are on the same face of the ring and trans configuration is when the groups are on opposite faces.Both isomers are stable and neither can be converted into the other without breaking and reforming chemical bonds.

 Step 2: Rules for naming of compound

• Find the parent

Count the number of carbon atoms in the ring and the number in the largest substituent whichever has highest carbon atom will be considered as parent. If the number of carbon atoms in the ring is equal to the number in the substituent in that case ring is taken as parent.

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• Number the substituents, and write the name.

For an alkyl- or halo-substituted cycloalkane, choose a point of attachment as carbon 1 and number the substituents on the ring so that the secondsubstituent has as low a number as possible. Same procedure for third or fourth substituent so has low number as much as possible, until a point of difference is found.

• When two or more different alkyl groups are present that could potentially take the same numbers, number them by alphabetical priority, ignoring numerical prefixes such as di- and tri-.

• If halogens are present, treat them just like alkyl groups.

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Name of structure:

a.

• The ring has 5 carbon atoms.
• One methyl group and one ethyl group is present..
• Hence, the name of the compound is $1-Ethyl-3-methylcyclopentane$

b.

• The ring has 6 carbon atoms.
• Three methyl group are present.
• Hence, the name of the compound is