Which of the following reactions give a carboxylic acid as one of the organic products (after acidification where needed)?

A $C X_{6} H X_{5} CCl X_{3}$ heated with aqueous NaOH, then $H X_{3} O X^{+}$
Bpropanenitrile refluxed with dilute HCl
Ctert-butyl acetate warmed with dilute $H X_{2} SO X_{4}$
D1,1-dichloroethane heated with aqueous NaOH

Answer: A, B, C

A trihalide on the same carbon hydrolyses to a carboxylic acid (benzoic acid). Nitrile hydrolysis gives propanoic acid, and ester hydrolysis gives acetic acid. 1,1-Dichloroethane gives ethanal, not an acid.

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