What is the correct bond energy of the following
C - X bond (where, X = Cl, Br, I) ?

Options

A. `C-ClgtC-BrgtC-I`
B. `C-IgtC-ClgtC-Br`
C. `C-BrgtC-ClgtCgtI`
D. `C-IgtC-BrgtC-Cl`

Answer

A

Explanation

The electronegativity of halogens decreases down the group, whereas the atomic size increases down the group. As the size of halogen atom increases, the C - X bond becomes weaker and hence the bond energy of C—X bond decreases down the group. Therefore, the correct order of bond energy is,
`C-Cl>C-Br>C-I`