Question

which molecule is a constitutional isomer of the compound (ch₃)₂ch(ch₂)₂ch₃?
ch₃ch₂ch₂ch(ch₃)₂

more than one of the molecules is a constitutional isomer of the original molecule.
question 15 (10 points)
what is the iupac name of this compound?
ch₃ - ch - ch - ch₂ch₂ch₃
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ch₃ ch₂ch₃
2 - methyl - 3 - propylpentane
3 - ethyl - 2 - methylhexane
2 - methyl - 3 - ethylhexane
4 - ethyl - 5 - methylheptane
4 - ethyl - 5 - methylhexane

Explanation:

Step1: Recall constitutional isomer concept

Constitutional isomers have same molecular formula but different connectivity. The formula of \((CH_3)_2CH(CH_2)_2CH_3\) is \(C_6H_{14}\). The first - given structure \(CH_3CH_2CH_2CH(CH_3)_2\) also has \(C_6H_{14}\) and different connectivity. The line - bond structures also represent \(C_6H_{14}\) compounds with different connectivities compared to the original.

Step2: Analyze IUPAC naming

For the compound \(CH_3 - CH(CH_3)-CH(CH_2CH_3)-CH_2CH_2CH_3\), find the longest carbon - chain. The longest chain has 6 carbons (hexane). Number the chain to give the lowest numbers to the substituents. There is a methyl group at the 2 - position and an ethyl group at the 3 - position. So the IUPAC name is 2 - methyl - 3 - ethylhexane.

Answer:

For the first question: More than one of the molecules is a constitutional isomer of the original molecule.
For the second question: 2 - methyl - 3 - ethylhexane