NTA Abhyas NEET2020Chemistryp Block Elements (Group 15, 16, 17 & 18)Practice
The correct order of increasing thermal stability of the given compounds is I. HF II. HBr III. HCl IV. HI
Options
- AI < I I < I I I < I V
- BI V < I I < I I I < I
- CI V < I I < I < I I I
- DI I < I V < I < I I I
Correct answer
B. I V < I I < I I I < I
Step-by-step solution
Stability depends on bond strength Bond strength depends on bond length. Bond length depends on the size of halides. Bigger bond length easily cleavage of H - X bond and thus, the correct order is HF > HCl > HBr > HI IV < II < III < I