(a) Describe the following giving linked chemical equations:
(i) Cannizzaro reaction
(ii) Decarboxylation
(b) Complete the following chemical equations:
      
(iii) \(C_6H_5CONH_2 \xrightarrow [heat] {H_3O^+}\)

(a) Identify A, B and C in the following sequence of reactions:

(b) Predict the structures of the products formed when benzaldehyde is treated with
(i) conc. NaOH
(ii) HNO₃ / H₂SO₄ (at 273 - 383 k)

An organic compound (A) on treatment with ethyl alcohol gives a carboxylic acid (B) and compound (C).  Hydrolysis of (C) under acidified conditions gives (B) and (D).  Oxidation of (D) with KMnO₄ also gives (B).  (B) on healting with Ca(OH)₂ gives (E) having molecular formula C₃H₆O.  (E) does not give Tollen's test and does not reduce Fehling's solution but forms a 2, 4-dinitrophenylhydrazone.  Identify (A), (B), (C), (D) and (E).

(a) How will you bring about the following conversions?
(i) Ethanol to acetone
(ii) Benzene to acetophenone
(iii) Benzoic acid to benzaldehyde
(b) Describe the following giving a suitable example in each case:
(i) Decarboxylation
(ii) Cannizzaro's reaction

Addition of Grignard reagents to dry ice followed by hydrolysis gives carboxylic acids while that of organolithium compounds under similar conditions gives ketones. Explain

Me₃CCH₂COOH is more acidic than Me₃SiCH₂COOH

(i) Write the structures of A, B, C, D and.E in the following reactions:

(ii) Write the chemical equation for the reaction involved in Cannizzaro reaction
(iii) Draw the structure of the semicarbazone of ethanal.
(iv) Why pK_a of F - CH₂ - COOH is lower than that of Cl- CH₂ - COOH?
(v) Write the product in the following reaction
\({ CH }_{ 3 }-CH=CH-{ CH }_{ 2 }CN\begin{matrix} (i)\quad DIBAL-H \\ \longrightarrow \\ (ii)\ H_{ 2 }O \end{matrix}?\)
(vi) How can you distinguish between propanal and propanone?

An organic compound (A) on treatment with ethyl alcohol gives a carboxylic acid (B) and compound (C). Hydrolysis of (C) under acidified conditions gives (B) and (D). Oxidation of (D) with KMnO₄ also gives (B). (B) on heating with Ca(OH)2 gives (E) having moleuclar formula C₃H₆O. (E) does not give TOllens'test and does not reduce Fehiling's solution but forms 2, 4-dinitrophenyhydrazone. Identify (A),(B),(C),(D) and (E).

An organic compound (A) having molecular formula, C₂H₄O reduces Tollens' reagent. Two moles of (A) react with AI(OC₂H₅)₃ to yield C₄H₈O₂ (B) which reacts with NH₃ to give C₂H₆O (C) and C₂H₅NO (D). Identify A,B,C and D.