Which of the following alkyl halides is most reactive towards an Mg atom?

Explanation

Alkyl iodide (alkyl iodides) is the most reactive towards a magnesium (Mg) atom in a reaction known as the Grignard reaction. The reactivity of alkyl halides towards Mg follows the order: Alkyl iodide > Alkyl bromide > Alkyl chloride > Alkyl fluoride. The reactivity of alkyl halides with magnesium is a crucial aspect of the Grignard reaction, where the magnesium atom acts as a nucleophile, attacking the carbon-halogen bond of the alkyl halide to form a new carbon-magnesium bond. Alkyl iodides have the weakest carbon-halogen bond among the given options, making them the most susceptible to nucleophilic attack and, therefore, the most reactive.