Number of reagents which can convert pivaldehyde into carboxylic acid or its salt.
(1) conc. $OH^{-}$ (2) $CF_{3} - COOH$ (3) $[Ag (NH_{3})_{2}]^{+} OH^{-}$
(4) $HgCl_{2}$ (aq.) (5) $CH_{3} - COOH$ (6) $K_{2} Cr_{2} O_{7}, H^{+}, Δ$
(7) $KMnO_{4}, H^{+}, Δ$ (8) Anhydrous $H_{2} CrO_{4}$

Question

Number of reagents which can convert pivaldehyde into carboxylic acid or its salt.

(1) conc. $OH^{-}$ (2) $CF_{3} - COOH$ (3) $[Ag (NH_{3})_{2}]^{+} OH^{-}$

(4) $HgCl_{2}$ (aq.) (5) $CH_{3} - COOH$ (6) $K_{2} Cr_{2} O_{7}, H^{+}, Δ$

(7) $KMnO_{4}, H^{+}, Δ$ (8) Anhydrous $H_{2} CrO_{4}$

TestHub · Accepted Answer

Pivaldehyde (CH₃)₃CCHO has no α-H, so conc. OH⁻ gives Cannizzaro reaction forming pivalate salt → (1).

Tollens' reagent $[A g (N H_{3})_{2}]^{+} O H^{-}$ , K₂Cr₂O₇/H⁺/Δ and KMnO₄/H⁺/Δ oxidize aldehyde to pivalic acid → (3), (6), (7).

HgCl₂(aq.) also acts as an oxidizing reagent for aldehydes (aldehyde → carboxylic acid), so it is (4).

CF₃COOH, CH₃COOH and anhydrous H₂CrO₄ do not convert pivaldehyde into carboxylic acid/salt.

Correct reagents: (1), (3), (4), (6), (7)

Chemistry - Carboxylic acid and their Derivatives Question with Solution | TestHub