The correct order of the thermal stability of hydrogen halides (H-X) is
- HI > HCl < HF > HBr
- HCl < HF > HBr < HI
- HF > HCl > HBr > HI
- HI < HBr > HCl < HF
The Correct Option is C
Solution and Explanation
$\begin{matrix}H-F&H-Cl&H-Br&H-I\\ 135\,kcal\,mol ^{-1}&103\,kcal\,mol ^{-1}&85\,kcal\,mol ^{-1}&71\,kcal\,mol ^{-1}\end{matrix}$
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Concepts Used:
Group 17 Elements
Halogens are the group 17 elements of the periodic table. The term ‘halogen’ means ‘salt-producing’, hence the name halogens as they possess the tendency to form salts after reacting to metals. It generally has five elements:
- Fluorine (F)
- Chlorine (Cl)
- Bromine (Br)
- Iodine (I)
- Astatine (At)
These are all naturally occurring halogens but Tennessine (Ts) is an artificially created halogen.
Halogens:
Halogens are highly reactive elements and are highly electronegative. They have a high tendency to react with metals to form salts. They are also known as Group 17 elements. They have 7 electrons in their outer shell with a configuration of (ns2 np5). Fluorine being the first halogen in group 17, is highly reactive. Astatine is a halogen because of its resemblance with iodine despite it being radioactive.
Electronic Configuration:
The general electronic configuration for group 17 elements is ns2np5. This configuration clearly shows that they have 7 electrons in their valence shell. They require one more electron to complete their octet and achieve noble gas configuration.
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