why ccl3cho does not give cannizaro reaction?

Q. The compound that does not undergo cannizaro reaction is:

Q. Why carboxylic acid does not give reaction of carbonyl group?

Q. A compound A with molecular formula $C_{10}{H}_{13}Cl$ gives a white precipitate on adding silver nitrate solution. A on reacting with alcoholic KOH gives compound B as the main product. B on ozonolysis gives C and D. C gives Cannizaro reaction but not alodol condensation. D gives aldol condensation but not Cannizaro reaction. A is:

Q. The number of compounds that give cannizaro reaction: