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Presence of which reagent will affect the reversibility of the following reaction, and change it to an irreversible reaction : CH4 + I2 —hv→ CH3−I + HI Reversible

1. HOCl
2. dilute HNO2
3. Liquid NH3
4. Concentrated HIO3

Correct answer: dilute HNO2

Solution

Dilute HNO2 can oxidize the methyl iodide (CH3-I) produced in the reaction, driving the equilibrium towards the products and effectively making the reaction irreversible.

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