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Give the correct name and explain your reasoning. (a) trans-3-Pentene (b) 1,1-Dimethylethene (c) 2-Methylcyclohexene (d) 4-Methylcyclobute (f) 5,6-Dichlorocyclohexene

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Final answer:

The correct name for the compound is 3-methyl-2-pentene.

Step-by-step explanation:

The chemical name "3-methyl-2-pentene" describes a hydrocarbon compound belonging to the alkene class. Let's break down the name to understand its structure:

Pentene: This indicates that the hydrocarbon has five carbon atoms in its main chain. The suffix "-ene" suggests that it is an alkene, which means it contains a double bond.

2: The "2" indicates that the double bond is located on the second carbon atom in the main chain.

3-methyl: There is a methyl group (CH₃) attached to the third carbon atom of the main chain.

b. The longest chain containing the double bond has five carbon atoms, so the parent compound is a pentene (rule 1). To give the first carbon atom of the double bond the lowest number (rule 2), we number from the left, so the compound is a 2-pentene.

There is a methyl group on the third carbon atom (rule 3), so the compound's name is 3-methyl-2-pentene.

User Sergey Mikhanov
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