question_answer

  (a) Describe the following with the help of suitable examples : (i) Clemmensen reduction (ii) Cannizzaro's reaction. (b) Give one chemical reaction that can distinguish 2-pentanone from 3-pentanone. (i) The hybridized state of carbon (ii) the a and n bonds present and (iii) the electrophilic and nucleophilic centres in it.

Answer:

  (a) (i) Carbonyl group on reduction with zinc amalgam and cone.  gives alkane. This is called Clemmensen reduction. (ii) Aldehyde having nohydrogen on reaction with cone.  gives alcohol and salt of carboxylic acid (b) lodoform test. No reaction.