Propane → 2-Iodopropane

Best reagent for the above conversion is:

• (a) I₂/hv
• (b) NaI / acetone
• (c) F₂/hv, NaI / acetone
• (d) Br₂/hv, NaI / acetone

To convert propane to 2-iodopropane, the best reagent from the options provided is:

Recommended Reagent

(a) I₂/hv

Explanation

This reaction involves the halogenation of propane, where iodine (I₂) is used in the presence of light (hv) to facilitate the reaction. This method effectively introduces iodine into the propane molecule, leading to the formation of 2-iodopropane.

Other Options

• (b) NaI / acetone: This is typically used for nucleophilic substitution reactions, not for direct halogenation.
• (c) F₂/hv, NaI / acetone: Fluorine is too reactive and can lead to multiple substitutions, making it unsuitable for this specific conversion.
• (d) Br₂/hv, NaI / acetone: While bromine can halogenate, it is less selective than iodine for this particular transformation.

In summary, option (a) I₂/hv is the most effective choice for converting propane to 2-iodopropane.