Chapter 17: Problem 77

Give the line drawing and molecular formula for: (a) 3 -methylpentane (b) 2,3 -dimethyl-2-butene (c) 3 -methyl-1-pentene (d) 5 -methyl-1-hexyne

Short Answer

Expert verified

(a) Line drawing: ``` CH_3 | CH_3-CH-CH_2-CH_3 ``` Molecular formula: \(C_6H_{14}\) (b) Line drawing: ``` CH_3 CH_3 | | CH_2=C-CH_2-CH_3 ``` Molecular formula: \(C_6H_{12}\) (c) Line drawing: ``` CH_3 | CH_2=CH-CH_2-CH_3 ``` Molecular formula: \(C_6H_{12}\) (d) Line drawing: ``` CH_3 | CH≡C-CH_2-CH_2-CH_2-CH_3 ``` Molecular formula: \(C_7H_{12}\)

Step by step solution

(a) 3-Methylpentane

First, identify the main carbon chain in the name, which is "pentane", meaning a 5-carbon chain. Next, locate the substituent(s) and their position(s). We see the prefix "3-methyl", indicating a methyl (CH_3) group at position 3. Draw a 5-carbon chain and add a methyl group at position 3. The line drawing and molecular formula are: Line drawing: ``` CH_3 | CH_3-CH-CH_2-CH_3 ``` Molecular formula: \(C_6H_{14}\)

(b) 2,3-Dimethyl-2-butene

The main carbon chain is "butene", meaning a 4-carbon chain with a carbon-carbon double bond. The position of the double bond is unspecified, so it will be at position 1. There are two substituents, both methyl groups, located at positions 2 and 3 on the chain. Draw a 4-carbon chain with a double bond at position 1 and two methyl groups at positions 2 and 3. The line drawing and molecular formula are: Line drawing: ``` CH_3 CH_3 | | CH_2=C-CH_2-CH_3 ``` Molecular formula: \(C_6H_{12}\)

(c) 3-Methyl-1-pentene

The main carbon chain is "pentene", meaning a 5-carbon chain with a carbon-carbon double bond. Since the double bond is specified at position 1, it will be at the first carbon. The substituent is a methyl group at position 3. Draw a 5-carbon chain with a double bond at position 1 and a methyl group at position 3. The line drawing and molecular formula are: Line drawing: ``` CH_3 | CH_2=CH-CH_2-CH_3 ``` Molecular formula: \(C_6H_{12}\)

(d) 5-Methyl-1-hexyne

The main carbon chain is "hexyne", meaning a 6-carbon chain with a carbon-carbon triple bond. Since the triple bond is specified at position 1, it will be at the first carbon. The substituent is a methyl group at position 5. Draw a 6-carbon chain with a triple bond at position 1 and a methyl group at position 5. The line drawing and molecular formula are: Line drawing: ``` CH_3 | CH≡C-CH_2-CH_2-CH_2-CH_3 ``` Molecular formula: \(C_7H_{12}\)

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Give the line drawing and molecular formula for: (a) 3 -methylpentane (b) 2,3 -dimethyl-2-butene (c) 3 -methyl-1-pentene (d) 5 -methyl-1-hexyne

Short Answer

Step by step solution

(a) 3-Methylpentane

(b) 2,3-Dimethyl-2-butene

(c) 3-Methyl-1-pentene

(d) 5-Methyl-1-hexyne

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