Consider the following reactions. From these reactions which reaction will give carboxylic acid as a major product ? (A) R - C N [ mild condition ] (i) H ⁺ / H ₂ O (B) R - MgX [ (ii) H ₃ O ⁺] (i) CO ₂ (C) R - C N [ (ii) H ₃ O ⁺] (i) SnCl ₂ / HCl (D) R CH ₂ OH PCC (E) Choose the correct answer from the options given below:

Step-by-step solution

(A) R - C N [ mild condition ] (i) H ⁺ / H ₂ O R - CONH ₂ Under mild condition amide is formed because this reaction is typically slow if further more heat will supplied then it gets convert in to -COOH. (B) R - MgX [ (ii) H ₃ O ⁺] (i) CO ₂ R - COOH (C) R - C N [ (ii) H ₃ O ⁺] (i) SnCl ₂ / HCl R - CHO (D) R CH ₂ OH PCC R - CHO (E)