Question

111. Which of the molecules has highest bond length (A”)?
1)H-F
(2) H-Cl
3)H-Br
4)H-I​

Answer 1

The molecules has highest bond length (A") is H-I

Answer 2

The highest bond length is for $H-I$

Explanation:

• The bond length of a molecule is the average distance between the nuclei of the atoms.
• So, the more is the size of the atoms more will be the bond length.
• Here, $H$ is present in all the given molecules.
• Hence, the bond length will be determined by the size of the Halogens.
• Greater is the size, more is the distance between the nuclei of the atoms.
• Order of size of halogens $I > Br > Cl > F$
• Therefore, the order of bond length is $HI > HBr > HCl > HF$
• Hence, the highest bond length is for $H-I$