Introduction:

Sulphuric acid (H2SO4) is a strong acid commonly used in various chemical reactions. However, it is not suitable for the reaction of alcohol with potassium iodide (KI) due to several reasons. In this explanation, we will discuss the factors that make sulphuric acid unsuitable for this particular reaction.

1. Acid-catalyzed dehydration:
When alcohol reacts with sulphuric acid, it undergoes acid-catalyzed dehydration to form an alkene. This reaction is not desirable in the context of the reaction of alcohol with KI because it can lead to the formation of unwanted byproducts and reduce the overall yield of the desired product.

2. Oxidation potential:
Sulphuric acid is a strong oxidizing agent and has a high oxidation potential. This means that it can oxidize the iodide ions (I-) present in KI to iodine (I2) or other higher oxidation states. This can interfere with the desired reaction and lead to the formation of undesired products.

3. Acid-base reaction:
Sulphuric acid is a strong acid, and KI is a salt that contains iodide ions (I-). When these substances are mixed, an acid-base reaction occurs, leading to the formation of iodine gas (I2) and water (H2O). This reaction is not desired in the context of the reaction of alcohol with KI, as it deviates from the intended reaction pathway.

4. Safety concerns:
Sulphuric acid is highly corrosive and can cause severe burns if it comes into contact with the skin or eyes. It also releases toxic fumes when heated or mixed with certain substances. Using sulphuric acid in the reaction of alcohol with KI can increase the risk of accidents and pose a threat to the safety of individuals performing the experiment.

Conclusion:
In conclusion, sulphuric acid is not used in the reaction of alcohol with potassium iodide due to its acid-catalyzed dehydration properties, high oxidation potential, tendency to undergo acid-base reactions with KI, and safety concerns. It is important to choose suitable reagents and conditions that promote the desired reaction while minimizing the formation of unwanted byproducts and ensuring the safety of the experiment.