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Magazine Chapter 17: Q.3. (page 641)
Question: Give the IUPAC name for each compound.
a.
b.
c.
d.
Short Answer
Answer
- m-1,3-diisopropylbenzene
- 1-sec-butyl-4-ethylbenzene
- m-butylphenol
- 2-bromo-5-chlorotoulene
Step by step solution
Rules for IUPAC nomenclature for compounds containing an aromatic ring
- For one substituent - the name of substituent followed by word benzene
- For two substituent - use prefix for position
1,2 - ortho
1,3 - meta
1,4 - para
Name the substituent in alphabetical order (excluding prefix)
- For more than two substituents - the number the substituent to get the lowest numbers possible
- If the ring is derivative of monosubstituted benzene, then replace benzene with the common name.
IUPAC name of the compound
a. Two isopropyl groups at 1st and 3rd position - meta
Therefore, the IUPAC name of the compound is:
m-1,3-diisopropylbenzene
b. Two groups at 1 and 4 position - para
Therefore, the IUPAC name of the compound is:
1-sec-butyl-4-ethylbenzene
c. Monosubstituted derivative of benzene.
Benzene ring with -OH group - common name 鈥榩henol鈥�.
One substituent at 3rd position with respect to OH 鈥� meta.
Therefore, the IUPAC name of the compound is:
m-butyl-phenol
d. Monosubstituted derivative of benzene.
Benzene ring with group - common name 鈥榯oluene鈥�.
The molecule is named as benzene derivative therefore group is numbered 1.
Therefore, the IUPAC name of the compound is:
2-bromo-5-chlorotoulene
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