Question

Question: Give the IUPAC name for each compound.

a.

b.

c.

d.

Short answer

Answer

1. m-1,3-diisopropylbenzene
2. 1-sec-butyl-4-ethylbenzene
3. m-butylphenol
4. 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 ‘phenol’.

One substituent at 3rd position with respect to OH – meta.

Therefore, the IUPAC name of the compound is:

m-butyl-phenol

d. Monosubstituted derivative of benzene.

Benzene ring with $-C{H}_3$ group - common name ‘toluene’.

The molecule is named as benzene derivative therefore $-C{H}_3$group is numbered 1.

Therefore, the IUPAC name of the compound is:

2-bromo-5-chlorotoulene