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Concept explainers
Interpretation:
The correct name for the given compound has to be chosen from the given set of options..
Concept Introduction:
When hydrogen atoms are replaced by one or more groups in benzene is known as substitution reaction and the compounds produced is benzene derivatives.
Benzene derivative with one substituent:
IUPAC system of naming monosubstituted benzene derivatives uses the name of substituent as prefix to the name benzene. If the group that is present in benzene cannot be named easily means, then the benzene ring is often treated as group attached to this substituent. The benzene ring is known as phenyl in this approach.
Benzene derivative with two substituents:
When benzene ring contains two substituents it is known as disubstituted benzene derivative. Three isomers are possible for the disubstituted benzene derivative. The prefix used in IUPAC name are,
Ortho- means disubstitution in 1,2
Meta- means disubstitution in 1,3
Para- means disubstitution in 1,4
When both the substituents present on the benzene ring imparts a special name, where all the substituents are cited in alphabetical order before the ending –benzene. The carbon that bears the group with alphabetical priority is given number 1.
Benzene derivatives with three or more substituents:
More than two groups are present in the benzene ring means, their positions are numbered. The numbering is always done in a way that the carbon atom bearing substituent gets the lowest numbering possible. If there is a choice of numbering system, then the group that comes alphabetically first is given the lowest number.
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Chapter 2 Solutions
Organic And Biological Chemistry
- 20. Which of the following compounds consists of molecules that show geometrical (cis-trans) isomerism? a. 2-methylpropene b. 2-butene c. 2-methyl-2-butene d. more than one response is correct e. no correct responsearrow_forwardThe correct IUPAC name for the compound CH2=CH-CH2-CH3 is a. butene b. 1-butene c. 1,2-butene d. no correct responsearrow_forwardThe name for the alkyl group CH3—CH2—CH2— isa. propaneylb. propylc. alkylpropaned. no correct responsearrow_forward
- What is the IUPAC name for the ether whose common name is ethyl propyl ether? a. 1-ethoxypropane b.2-ethoxypropane c.1-propoxyethane d.no correct responsearrow_forwardWhat is the IUPAC name for the ether whose common name is ethyl propyl ether?a. 1-ethoxypropaneb. 2-ethoxypropanec. 1-propoxyethaned. no correct responsearrow_forwardIn which of the following alkanes are 10 carbon atoms present? O a) 2,3-dimethyloctane O b) 3-ethyl-2,4-dimethylpentane O 93,4-diethylhexane d) more than one correct responsearrow_forward
- 10. Which of the following structural formulas represents a normal alkane? CH;-CH2-CH-CH; CH CH3-CH,-CH2 CH, CH3 b. c. SH-CH, CH-CH, CH3 od. CH3-C-CH3 e. no correct responsearrow_forward20. Which of the following compounds consists of molecules that show geometrical (cis-trans) isomerism? a. 2-methylpropene b. 2-butene Oc. 2-methyl-2-butene Od. more than one response is correct e. no correct responsearrow_forward30. Which of the following is a structural isomer of 1,3-dimethylbenzene? CH3 a. CH3 b. CH3 CH3 CH; d. more than one response is correct e. no correct responsearrow_forward
- Organic And Biological ChemistryChemistryISBN:9781305081079Author:STOKER, H. Stephen (howard Stephen)Publisher:Cengage Learning,General, Organic, and Biological ChemistryChemistryISBN:9781285853918Author:H. Stephen StokerPublisher:Cengage Learning
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