Assertion: HI cannot be prepared by the reaction of KI with concentrated H2SO4.

Reason: HI has the lowest H—X bond strength among halogen acids.

1. Both the assertion and the reason are correct statements and the reason is the correct explanation of the Assertion.

2. Both the assertion and the reason are correct statements and the reason is not the correct explanation of the Assertion.

3. The assertion is correct but the reason is the wrong statement.

4. The assertion is incorrect but the reason is a correct statement.

HINT: H2SO4 is a strong oxidising agent
Explanation:
STEP 1: HI cannot be prepared by the reaction of KI with concentrated H2SO4 because H2SO4 is a strong oxidising agent and it oxidised I- into I2 .
The reaction will be: 
2KI +H2SO4  K2SO4 + I2 + H2S + H2O
STEP 2: In the case of hydrogen halides (HX), The stability of these halides decreases down the group due to a decrease in bond
(H–X) dissociation enthalpy. Thus, HI has the lowest H—X bond strength among halogen acids.
Here, both Assertion and Reason are correct statements, and Reason is not the correct explanation of the Assertion.