Acetamide and ethylamine can be distinguished ,by reacting with
Br2 water
acidic KMnO4
aq HCl and heat
aq NaOH and heat
The basicity of aniline is less than that of cyclohexylamine. This is due to :
+R-effect of-NH2 group
-I effect of -NH2 group
-R effect of-NH2 group
hyperconjugation effect
Which of the following would undergo Hofmann reaction to give a primary amine?
R-CO-Cl
RCONHCH3
RCONH2
RCOOR
Hofmann's bromamide reaction is to convert
acid to alcohol
alcohol to acid
amide to amine
amine to amide
An alkyl halide reacts with alcoholic ammonia in a sealed tube, the product formed will be
a primary amine
a secondary amine
a tertiary amine
a mixture of all the three
Arrange the following in the increasing order of their basic strengths CH3NH2, (CH3)2NH, (CH3)N, NH3
NH3 < (CH3)N < (CH3)2NH < CH3NH2
NH3 < (CH3)N < CH3NH2 < (CH3)2NH
(CH3)N < NH3 < CH3NH2 < (CH3)2NH
CH3NH2 < (CH3)2NH < (CH3)N < NH3
Which one of the following has the most nucleophilic nitrogen?
A.
Nucleophiles are the species which have excess of electrons. Among the given species, the lone pair of nitrogen of pyrrole is involved in delocalisation of the ring, thus, are not available for donation. In aniline, the lone pair is involved in conjugation with, the π electrons of the ring while in pyridine, these are relatively free for donation. Thus, nitrogen of pyridine is most nucleophilic.
(phenyl and —COCH3 both are electron withdrawing groups, thus decreases the nucleophilicity of nitrogen).
The correct sequence of reactions to convert p-nitrophenol into quinol involves
reduction, diazotization and hydrolysis
hydrolysis, diazotization and reduction
hydrolysis, reduction and diazotization
diazotization, reduction and hydrolysis