Which of the following statements is wrong?

• A. The base-catalysed α-halogenation of propanone is first order in the concentration of the base
• B. The rate constant for the base-catalysed α-halogenation of propanone decreases in the order Cl2 > Br2 > I2
• C. The base-catalysed α-halogenation of propanone proceeds easily to give 1,1,1-trihalopropanone
• D. Polyhalogenation of propanone is difficult under acidic conditions, but the products are the same as those obtained under basic conditions