Question

The products A and B obtained in the following reactions, respectively, are
3ROH+PCI₃→3RCI+A 
ROH+PCI₅→RCI+HCI+B

• A. POCI₃ and H₃PO₃
• B. POCI₃ and H₃PO₄
• C. H₃PO₄ and POCI₃
• D. H₃PO₃ and POCI₃

Answer 1

The Correct Option is D

The given reactions involve the conversion of alcohols (ROH) to alkyl chlorides (RCl) using phosphorus chlorides (PCl₃ and PCl₅). Let's analyze each reaction to determine the products:

1. In the reaction 3ROH+PCl₃→3RCl+A, the alcohols react with phosphorus trichloride (PCl₃) to form alkyl chlorides (RCl) and a phosphorus-containing compound A as a byproduct. The balanced reaction is:

PCl₃ + 3ROH → 3RCl + H₃PO₃

Thus, the product A is H₃PO₃ (phosphorous acid).

2. In the second reaction ROH+PCl₅→RCl+HCl+B, the alcohol is converted to the alkyl chloride (RCl), and hydrogen chloride (HCl) is formed along with a phosphorus-containing compound B. Here, phosphorus pentachloride (PCl₅) breaks down, and the balanced equation is:

PCl₅ + ROH → RCl + HCl + POCl₃

Thus, the product B is POCl₃ (phosphoryl chloride).

Based on the analysis, the products A and B for each reaction are:

Reaction	Product A	Product B
3ROH+PCl3→3RCl+A	H3PO3	-
ROH+PCl5→RCl+HCl+B	-	POCl3

The correct answer is: H₃PO₃ and POCl₃.