Q20 of 22 Page 1

Predict the products of the following reactions:

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(i) It is addition of derivative of ammonia which is hydrazine here on the carbonyl carbon of ketone to give hydrazone.


(ii) When alkaline KMnO4 reacts with toluene, the entire side chain is oxidized to carboxyl group forming benzoic acid irrespective of length of side chain.


(iii) Benzoic acid undergo electrophilic substitution reaction in which –COOH group acts as meta directing and thus, on addition of Br2/FeBr3, m-bromobenzoic acid is formed.


The reactions for all three are as follows-


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18

Write any three differences between Physisorption and Chemisorption.

 19

Give reasons for the following:

(i) Phenol is more acidic than methanol.


(ii) The C – O – H bond angle in alcohols is slightly less than the tetrahedral angle (109°28’).


(iii) (CH3)3C – O – CH3 on reaction with HI gives (CH3)3C - I and CH3 – OH as the main products and not (CH3)3C – OH and CH3- I.


 21

(a) Account for the following:

(i) Cu+ is unstable in an aqueous solution.


(ii) Transition metals form complex compounds.


(b) Complete the following equation:


Cr2O72- + 8H+ + 3NO2- →


 22

Write the names and structures of the monomers of the following polymers:

(i) Terylene


(ii) Buna-S


(iii) Neoprene