To distinguish between cis-cyclopenta-1,2-diol and trans-cyclopenta-1,2-diol, we need to consider their stereochemistry and how they interact with different reagents.$\\$• Cis-cyclopenta-1,2-diol has both hydroxyl groups on the same side of the cyclopentane ring, making it more polar and capable of forming intramolecular hydrogen bonds.$\\$• Trans-cyclopenta-1,2-diol has hydroxyl groups on opposite sides of the cyclopentane ring, making it less polar and unable to form intramolecular hydrogen bonds.$\\$Let's analyze each reagent:$\\$1. Acetone:$\\$• Acetone is a polar aprotic solvent that can dissolve polar compounds.$\\$• Cis-cyclopenta-1,2-diol, being more polar, will dissolve better in acetone compared to the trans isomer.$\\$• This difference in solubility can be used to distinguish between the two isomers.$\\$2. Ozone:$\\$• Ozone is used for oxidative cleavage of alkenes, not for distinguishing diols.$\\$3. $\mathrm{MnO_2}: \\$• Manganese dioxide is an oxidizing agent that typically oxidizes allylic and benzylic alcohols.$\\$• It does not distinguish between cis and trans diols.$\\$4. Aluminum isopropoxide:$\\$• Aluminum isopropoxide is used in the Meerwein-Ponndorf-Verley reduction, which is not applicable for distinguishing diols.$\\$Therefore, the correct reagent to distinguish cis-cyclopenta-1,2-diol from the trans isomer is acetone, due to the difference in solubility.$\\$The correct option is Option 1: Acetone.