Arrange the following compounds in decreasing order of the acidity of the indicated hydrogen atom (H): (i) (ii) (iii)

Step-by-step solution

The acidity of a hydrogen atom is directly proportional to the stability of its conjugate base formed after the removal of a proton ( H^+ ). 1. For compound (i) (cyclopentadiene), the removal of H^+ yields the cyclopentadienyl anion. This anion is cyclic, planar, fully conjugated, and has 6 electrons. It satisfies Huckel's rule ( 4n+2 electrons, where n=1 ), making it aromatic. This aromaticity provides exceptional stability to the conjugate base. 2. For compound (ii) (cycloheptane), the removal of H^+ yields the c