The IUPAC name of the compound CF₃CHBrCl is

Correct Answer is : 2-bromo-2-chloro-1,1,1-trifluoroethane

2-chloro-2-bromo-1,1,1-trifluoroethane

1-bromo-1-chloro-2,2,2-trifluoroethane

1,1,1-trifluoro-2-bromo-2-chloroethane

Correct Answer is : 2-bromo-2-chloro-1,1,1-trifluoroethane

Test Index

JAMB Chemistry 2019 Paper

Question : 7

Total: 80

_3

CHBrCl is

Solution:

Concept:

Number the ethane carbon chain to give the lowest locant set, then list substituents alphabetically.

Explanation:

The compound is

\mathrm{CF_3CHBrCl}

, which is a two-carbon ethane chain.

Carbon 1 has three fluorine atoms, and carbon 2 has bromine and chlorine atoms.

Numbering from the

\mathrm{CF_3}

end gives locants:

1,1,1

for fluorine and

2,2

for bromine and chlorine.

Numbering from the other end would give

1,1

for bromine/chlorine and

2,2,2

for fluorine, which is a higher locant set.

So the correct numbering is from the

\mathrm{CF_3}

end.

Alphabetically: bromo before chloro before fluoro.

Answer:

2-bromo-2-chloro-1,1,1-trifluoroethane

Correct option: B

Go to Question:

Prev Question

Next Question