Q18 of 26 Page 1

Give reasons for the following :

A. Aldehydes (R-CHO) are more reactive than ketones (R-CO-R) towards nucleophilic addition reaction.


B. Benzaldehyde does not undergo an aldol condensation reaction.


C. Benzoic acid does not give a Friedel-Crafts reaction.


A) During nucleophilic addition reaction, if the leaving group is weak then reaction is more reactive and vice-versa. In Aldehydes the leaving group is -H and in ketone it will be -R(alkanes). Comparing them -H is more weak than -R in context leaving group. Hence, Aldehydes are more reactive than ketones.


B) Due to lack of -hyrogen, Benzaldehyde does not undergo an aldol condensation reaction.


C) The main reason is because AlCl3gets reacted to carboxylic acid of group in benzoic acid to form benzoyl chloride.


More from this chapter

All 26 →
16

Give reasons :

A. Mn shows the highest oxidation state of +7 with oxygen but with fluorine, it shows the highest oxidation state of +4


B. Zn is soft whereas Cr is hard.


C. is a good reducing agent.


 17

What happens when :

A. 2, 4, 6 – trinitrochlorobenzene is treated with warm water.


B. 2-chlorobutane is treated with alcoholic KOH.


C. Ethyl chloride is treated with Na metal in presence of dry ether.


Write the equation involved in the above reactions.


 19

Complete the following reactions :

A.


B.


20

A. What is the role of t-butyl peroxide in the polymerization of ethane?

B. Identify the monomers in the following polymer :



C. Arrange the following polymers in the increasing order of their intermolecular forces :


PVC, Nylon-6, Buna-N


OR


Write the mechanism of free radical polymerization of ethane.