Q19 of 31 Page 1

Write the structures of A, B and C in the following reactions:

A.


B.

a) Step 1: C6H5—COO-NH4+ → C6H5 —CO--NH2 Benzamide (A)


Step 2:



(A) Aniline (B)


Step 3:


NH2 NHCOCH3



(B) acetanilide (C)


Thus, A is C6H5 —CO--NH2


B is C6H5—NH2


C is C6H5—NH—COCH3


b) Step 1: C6H5—N2+BF4- reacts with NaNO2 to form (A)


Step 2:



Nitrobenzene(A) Aniline (B)


Step 3:



Aniline(B) Carbylamine (C)
Note: The above reaction is carbylamine reaction.

In this reaction, primary aliphatic or aromatic amine is warmed with chloroform (CHCl3) and an alcoholic solution of KOH produce isocyanides or carbylamines which have very unpleasant odours

Thus, A is C6H5—NO2


B is C6H5—NH2


C is C6H5—NC

More from this chapter

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17

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

A.


B.


C.

18

Given reasons for the following:

A. Protonation of Phenols is difficult whereas ethanol easily undergoes protonation.


B. Boiling point of ethanol is higher than that of dimethyl ether.


C. Anisole on reaction with HI gives phenol and as main products and not iodobenzene and

20

A. What is the role of benzoyl 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:


Nylon-6, 6 Polythene, Buna-S

 20

Write the mechanism of free radical polymerization of ethane.