Organic Chemistry

Created by: ALPHA1974
Created on: 17-12-15 10:49

Chapter 18 Introducing Organic Chemistry 18.1 Which one of the following molecules is butane? A CH3CH2CH3 B CH3CH2CH2CH3 C CH3CH2CH=CH2 D CH3CH2CH2CH2CH3

Answer: B Comment Butane is B. You can either get this right because you have learnt it, or you can work it out. ‘But-’ shows a chain of four carbons; ‘-ane’ shows that there are only carbon–carbon single bonds in the chain.

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18.2 Which one of the following molecules is propene? A CH3CH=CH2 B CH3CH2CH3 C CH3CH2CH=CH2 D CH3CH2CH2CH3

Answer: A Comment ‘Prop-’ shows a three carbon chain, and ‘-ene’ shows that it contains a carbon–carbon double bond. The answer is therefore A.

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18.3 What is the name of this hydrocarbon? A pentane B 2-methylpropane C 3-methylbutane D 2-methylbutane

Comment The longest chain you can find in this molecule is four carbon atoms long, and if you look at the number of things that each carbon is attached to, there isn’t any room for carbon–carbon double bonds. So the name is based on butane. There is

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18.4 What is the name of the molecule CH3CH2CH2OH ? A propane B ethanol C propan-1-ol D propan-2-ol

Answer: C Comment The molecule contains an -OH group and this is shown by the ending ‘-ol’. There are three carbon atoms in a chain with no double bonds, and so the name will be based on propane. Finally, the -OH group is on the number 1 carbon ato

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18.5 CH3  What is the name of the molecule CH3CHCHCH3 ?  CH3 A hexane B 2,3-dimethylpropane C 2,3-dimethylbutane D 2,3-dimethylpentane

Answer: C Comment The longest chain is four carbons, and there aren’t any carbon–carbon double bonds. That means that the name is based on butane. There are two methyl groups attached to the second and third carbon atoms in the chain. The name is 2,

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Other cards in this set

Card 2

Front

18.2 Which one of the following molecules is propene? A CH3CH=CH2 B CH3CH2CH3 C CH3CH2CH=CH2 D CH3CH2CH2CH3

Back

Answer: A Comment ‘Prop-’ shows a three carbon chain, and ‘-ene’ shows that it contains a carbon–carbon double bond. The answer is therefore A.

Card 3

Front

18.3 What is the name of this hydrocarbon? A pentane B 2-methylpropane C 3-methylbutane D 2-methylbutane

Back

Card 4

Front

18.4 What is the name of the molecule CH3CH2CH2OH ? A propane B ethanol C propan-1-ol D propan-2-ol

Back

Card 5

Front

18.5 CH3  What is the name of the molecule CH3CHCHCH3 ?  CH3 A hexane B 2,3-dimethylpropane C 2,3-dimethylbutane D 2,3-dimethylpentane

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Organic Chemistry