Question

Amongst the C-X bond (where X=Cl, Br, I ) the correct bond energy order is
1. C-Cl > C-Br > C-I
2. C-I >C-Cl > C-Br
3. C-Br > C-Cl > C-I
4. C-I > C-Br > C-Cl

Answer 1

Answer:

1

Explanation:

because of electronegativity

Answer 2

Answer:

1. C-Cl>C-Br>C-CI

Explanation:

• Bond energy depends on the Bond Strength . It can be explained as follows:
• Greater is the bond strength, greater will be its bond energy.
• So the stronger will be the bond,more energy is required to break it.
• Among Cl, Br and I ,the size of the Cl is the smallest. So the bond between C and Cl is more strong than that of between C and Br which is more than that of C and I.
• Another factor is the difference in electronegativity between Carbon and halides. The bond Strength is directly proportional to the difference in electronegativity.
• Greater is the difference in electronegativity between the carbon and halides, greater is the bond strength.
• The Electronegativity of Carbon is 2.55, that of Chlorine, Bromine and Iodine is 4.0, 2.8. 2.5 respectively.
• So the difference in electronegativity between Carbon and Halogen is in the following order:
• C-Cl>C-Br>C-I
• So the Bond strength is in the following order: C-Cl>C-Br>C-I.
• As the Bond energy is directly proportional to the Bond Strength, Bond energy of C-X ( where X=Cl, Br, I ) is of following order: C-Cl>C-Br>C-I.