Amides are converted to amines by the following reaction :
Perkin
Claisen
Hofmann
Clemmensen
C.
Hofmann
Amides are converted to amines by Hofmann reaction .In this reaction , when an amide is heated with an aqueous solution of KOH and Br2 , it gives a primary amine with one carbon atom less .
RCONH2 + Br2 + 4KOH RNH2 + 2KBr + K2CO3 + 2H2O
N2 gas is liberated when [HCl + NaNO2] reacts with the following compound :
(A) CH3CH2NH2 (B) Urea
(C) CH3CONH2 (D) C6H5NH2
The answer is :
A , B , C
A , B , D
A, C , D
B , C , D
Which of the following reactions does not yield an amine?
R-X + NH3
R-CHNOH + [H]
R-CN +H2O
R-CONH2
The chemical name for melamine is
1,3,5-Triamino-2,4,6-triazine
2,4,6-Triamino-1,3,5-triazine
2-Amino-1,3,5-triazine
2,4-Diamino-1,3,5-triazine
Bromine is added to cold dilute aqueous solution ofNaOH. The mixture is boiled. Which of the following statements is not true?
During the reaction bromine is present in four different oxidation states.
The greatest difference between the various oxidation states of bromine is 5.
On acidification ofthe final mixture bromine is formed.
Disproportionation of bromine occurs during the reaction.
The compound which on reaction with aqueous nitrous acid at low temperature produces an oily nitrosoamine is
methyl amine
ethyl amine
diethyl amine
triethyl amine
Hofmann's bromamide reaction is used to convert :
acid to alcohol
alcohol to acid
amide to amine
amine to amide
Compound A (molecular formula C3H8O) is treated with acidified potassium dichromate to form a product B (molecular formula C3H6O). B forms a shining silver mirror on warming with ammoniacal silver nitrate. B when treated with an aqueous solution of H2NCONHNH2. HCl and sodium acetate gives a product C. Identify the structure of C.
CH3CH2CH=NNHCONH2
CH3-C(CH3)=NNHCONH2
CH3-C(CH3)=NCONHNH2
CH3CH2CH=NCONHNH2