21.

How do you convert:
i) Chlorobenzene to biphenyl
ii) propene to 1-iodopropane
iii) 2-bromobutane to but-2ene

Or
Write the major products(s) in the following:

Write the final product (s) in each of the following reactions:

Give reasons for the following:
i) Aniline does not undergo Friedal-Crafts reaction.
ii) (CH3)₃N is more basic than (CH₃)₃N in an aqueous solution.
iii) Primary amines have higher boiling point than tertiary amines.

Due to hectic and busy schedule,Mr.Singh started taking junk food in the lunch break and slowly became habitual of eating food irregularly to excel in his field. One day during the meeting he felt severe chest pain and fell down. Mr Khanna, a close friend of Mr. Singh took him to doctor immediately. The doctor diagnosed that Mr Singh was suffering from acidity and prescribed some medicines. Mr Khanna advised him to eat home made food and change his lifestyle by doing yoga,meditation and some physical exercise. Mr Singh followed his friend's advice and after few days he started feeling better.

after reading the above passage, answer the following:

i) what are the values (at least two) displayed by Mr Khanna?
ii) What are antacid? Give one example
iii) would it be advisable to take an antacid for a long period of time ? Give

i) Mn Shows the highest oxidation state of +7 with oxygen but with fluorine it shows the highest oxidation state of +4.
ii) Cr²⁺ is a strong reducing agent.
iii) Cu²⁺ salts are coloured while Zn²⁺ salts are white.

b) Complete the following equations:

Distinguish between:
i) C₆H₅-COCH₃ and C₆H₅-CHO
ii) CH₃COOH and HCOOH

c) Arrange the following in the increasing order of their boiling points:
CH₃CHO,CH₃COOH,CH₃CH₂OH

Or

a) Write the chemical reaction involved in Wolff Kishner reduction.

b) Arrange the following in the increasing order of their reactivity towards nucleophilic addition reaction:
C₆H₅COCH₃, CH₃-CHO, CH₃COCH₃

c) why carboxylic acid does not give reactions of carbonyl group ?

d) Write the product in the following reaction

e) A and B are two functional isomers of compound C₃H₆O. On heating with NaOH and I₂, isomers B forms a yellow precipitate of iodoform whereas isomer A does not form any precipitate. Write the formulae of A and B.