QNEET-2024-Ch-33: NEET 2024 Chemistry - Class 12 NEET-2024-Ch-33 Solution: The products A and B obtained in the following reactions…

Let's analyze the given reactions and determine the products A and B . Reaction with PCl 3 : When an alcohol ( ROH ) reacts with phosphorus trichloride ( PCl 3 ), the hydroxyl group ( OH ) of the alcohol is replaced by a chloro group ( Cl ), resulting in the formation of an alkyl chloride ( RCl ). Additionally, the reaction produces phosphorous acid as a byproduct. This can be represented as: 3 ROH + PCl 3 _ 3 RCl + H 3 PO 3 Here, A is H 3 PO 3 (phosphorous acid). Reaction with PCl 5 : When an alcohol reacts with phosphorus pentachloride ( PCl 5 ), it also replaces the hydroxyl group with a chloro group. The reaction differs slightly in the byproducts; phosphorus oxychloride ( POCl 3 ) and hydrogen chloride ( HCl ) are produced: ROH + PCl 5 _ RCl + HCl + POCl 3 Here, B is POCl 3 (phosphorus oxychloride). Thus, in the reactions provided: A = H 3 PO 3 B = POCl 3 Matching these findings against the provided options, we see that Option D correctly identifies A as H 3 PO 3 and B as POCl 3 : Option D: H 3 PO 3 and POCl 3 This is the correct answer.