AIIMS 2011 Chemistry Types of Stereoisomers MCQ Question

1,2-Dihydroxy cyclopentane has two hydroxyl (-OH) groups attached to the cyclopentane ring at the 1 and 2 positions. The presence of these two substituents creates the potential for stereoisomerism due to the possibility of different spatial arrangements. Specifically, the two hydroxyl groups can be positioned either on the same side (cis) or on opposite sides (trans) of the cyclopentane ring. This results in two distinct configurations: one where both -OH groups are on the same side (cis) and another where they are on opposite sides (trans). Additionally, since the cyclopentane ring can also exhibit different orientations due to its non-planar structure, we can have different stereoisomers. Therefore, the total number of stereoisomers for 1,2-dihydroxy cyclopentane is 3: one for the cis configuration and two for the trans configuration (considering the ring's flexibility). Hence, the correct answer is C) 3. Other options are incorrect as they do not account for all possible stereoisomers formed by the different arrangements of the hydroxyl groups.