Which of the following order is incorrect?

Options

A. `HF lt HCl lt HBr lt HI` (density)
B. `HCllt HBr lt HI lt HF` (boiling point )
C. `HCl lt HBr lt HI lt HF` (melting point )
D. `HF lt HCl lt HBr lt HI` ( reducing agent)

Answer

3

Explanation

The unexpectedly high boiling point of `HF` arises because of the intermolecular `H` bond formed between the `F` atom of one molecular `H` atom of another molecule. The correct order of melting point is `HCl lt HBr lt HF lt HI`.
The low melting point of `Hf` (inspite of hydrogen bonding) is attributed to the fact that in the solid state ,the `HF` molecules adopt a zigzag arangemtn which interfers with close packed arrangment
Order of dipole moments is `HF(1.86D) gt HCl (1.11 D) gt HBr(0.79 D) gt Hi(0.38 D)`
Order of enthalpy of dissociation is : `HF gt HCl gt HBr gt HI`
The bond dissocation enthaply of `HF` is nearly twice the bond dissociation entalpy of `HI`
Order of acid dissociation constant is : `HI gt HBr gt HCl gt HF` Thus, `HF` produces less heat on dissociation in water.
`HF("hydrated")rarrH^(+)("hydrated")+F^(-)("hydrated")`