(i) Describe the preparation of acetic acid from acetylene.(ii) How can the following be obtained from acetic acid: (a) Acetone (b) Acetaldehyde? (iii) In what way can acetic acid be distinguished from acetone? (iv) Why carboxylic acid do not give the characteristic reactions of a carbonyl group?

(i) Describe the preparation of acetic acid from acetylene.(ii) How ca

1.	(i) Describe the preparation of acetic acid from acetylene.(ii) How can the following be obtained from acetic acid: (a) Acetone (b) Acetaldehyde? (iii) In what way can acetic acid be distinguished from acetone? (iv) Why carboxylic acid do not give the characteristic reactions of a carbonyl group?
Answer» Solution : (iii) Add `I_2`and NaOH, Acetone will GIVE yellow precipitate of iodoform WHEREAS acetic acid does not react to give any yellow precipitate.(or) Add SODIUM bicarbonate solution, Acetone will not react, but acetic acid will give brisk effervescence due to the evolution of `CO_2` . (IV) Carboxylic acid does not give the characteristic reactions of CARBONYL group due to resonance effect by the virtue of which it does not have free ( >C=O)carbonyl group.