1. Consider the following first order reactions: AU+V K BX+Y If 50% of the reaction A was completed when 87.5% of the reaction B was completed, the ratio of their rate constnats (A) 9 (B) 3 is (C) 1/3 (D) 1/9 2. The correct order of basic strength is: NH CH3 CH H NH CH, (I) (A) III II>IV>I (II) (III) (B) III IV II>I (IV) (C) III IV > III (D) IV III II>I 3. Arrange the following compounds, in the decreasing order of their pKa value NO. ST (I) (II) (III) (A) III >I> II (B) III > II>I (C) II>I>III (D) I < II < III CH