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Which is the weakest out of HF, HCl, HBr...

Which is the weakest out of HF, HCl, HBr and HI?

A

HF

B

HCl

C

HBr

D

HI

Text Solution

Verified by Experts

The correct Answer is:
A
Acidic strength of hydrogen halides is in the order `HF lt HCl lt HBr lt HI`
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Use the information and data given below to answer the questions (a) to (c), Stronger intermolecular forces result in higher boiling point. Strength of London forces increases with the number of electrons in the molecule. Boiling point of HF, HCl, HBr and HI are 293 K, 189 K, 206 K and 238 K respectively. Looking at the trend of boiling points of HCl, HBr and HI, explain out of dipole-dipole interaction and London interaction, which one is predominant here.

The intermediate carbocation formed in the reactions of HI,HBr, and HCl with propene is the same and the bond energy of HCl, HBr, and HI is 430.5 KJ mol^(-1), 363.7 KJ mol^(-1) and 296.8 KJ mol^(-1) respectively. What will be the order of reactivity of these halogen acids?

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