How many isomeric dichlorobenzenes are obtainable?

CHEMISTRY
POST UTME OAU

How many isomeric dichlorobenzenes are obtainable?

  • A) 1
  • B) 2
  • C) 3
  • D) 4

Correct Answer: C) 3

Explanation

To understand the number of isomeric dichlorobenzenes obtainable, we first need to know what isomers are and how they apply to dichlorobenzene.

Isomers are compounds that have the same molecular formula, but different structural arrangements. Dichlorobenzene has a molecular formula of C6H4Cl2, which means it has a benzene ring with two chlorine atoms attached to it. The chlorine atoms can be attached to the benzene ring in different positions, leading to different isomers.

There are three possible positions for the two chlorine atoms on the benzene ring:

  1. ortho- (1,2-dichlorobenzene) - The chlorine atoms are attached to adjacent carbon atoms in the ring.

  2. meta- (1,3-dichlorobenzene) - The chlorine atoms are attached to carbon atoms separated by one carbon atom in the ring.

  3. para- (1,4-dichlorobenzene) - The chlorine atoms are attached to carbon atoms separated by two carbon atoms in the ring.

    4. These positions give rise to three distinct isomeric dichlorobenzenes. Therefore, the correct answer isOption C: 3.

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