3-Isobutyl-1-2-methylheptane B) 3-sec-Butyl-2-methyloctane C) 5-Isobutyl-6-methy

Question

3-Isobutyl-1-2-methylheptane B) 3-sec-Butyl-2-methyloctane C) 5-Isobutyl-6-methylheptane D) 2-Ethyl-3-isopropyloctane E) 4-Isopropyl-3-methylnonane The correct IUPAC name for the following compound is: A) 1-Hydroxy-3-sec-butylcyclopentane B) 3-sec-Butyl-l-cyclopentanol E)3-Isobutyl-l-cyclopentanol An IUPAC name for the following compound is: A) 4-Isobutyl-3, 4-dimethylheptane B) 4-sec-Butyl-2, 4-dimethylheptane C) 2, 4, 5-Trimethyl-4-propylheptane D) 3, 4, 6-Trimethyl-4-propylheptane E) 4-Isobutyl-4, 5-dimethylheptane

Explanation / Answer

42)

B) 3-sec-Butyl-1-cyclopentanol is correct.

In above compound there is an alkyl straight chain which has a lesser number of carbons than the cycloalkane, and then the cycloalkane must be used as the primary parent chain. An alcohol group is attached to cyclopentane, so it will be suffixes ol. 3-sec-Butyl group is attached at carbon number 3, so use the prefixes 3-sec-Butyl. IUPAC name of compound is 3-sec-Butyl-1-cyclopentanol.

43)

A) 4-Isobutyl-3,4-dimethylheptane is correct.

Explanation-

Find the longest continuous carbon chain in the compound. The longest carbon chain consists of seven carbon atoms, therefore name it heptane. The hydrocarbon groups attached to the chain are called alkyl groups, such as methyl, ethyl, propyl, etc. One Isobutyl group is attached at carbon number 4, so use the prefixes 4 – Isobutyl. Here more than one methyl group is attached, one at carbon number 3 and other at carbon number 4, so use the prefixes 3,4 di . IUPAC name of compound is 4-Isobutyl-3,4-dimethylheptane .

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