Textbook Question
(b) Pentane is the alkane with a chain of five carbon atoms. Determine its molecular formula.
22. Organic Chemistry
Naming Cyclic Alkanes
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Give a systematic name for the below compound.
A
1-sec-butyl-3-methylcyclopentane
B
1-methyl-3-sec-butylcyclopentane
C
1-butyl-3-methylcyclopentane
D
1-methyl-3-butylpentane
Verified step by step guidance1
Identify the main carbon chain in the compound. In this case, the main ring is a cyclopentane, which is a five-membered carbon ring.
Determine the substituents attached to the main carbon chain. In the image, there are two substituents: a sec-butyl group and a methyl group.
Number the carbon atoms in the cyclopentane ring to give the substituents the lowest possible numbers. Start numbering from the carbon with the sec-butyl group, as it is the larger substituent.
Assign the numbers to the substituents based on the numbering of the ring. The sec-butyl group is on carbon 1, and the methyl group is on carbon 3.
Combine the information to write the systematic name. The name should reflect the substituents and their positions on the cyclopentane ring, resulting in the name 1-sec-butyl-3-methylcyclopentane.
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