Amines
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A compound with molecular mass 180 is acylated with CH3COCl to get a compound with molecular mass 390. The number of amino groups presents per molecule of the former compound is
-
2
-
5
-
4
-
6
B.
5
Since,each-COCH3 group displaces one H atom in the reaction of one mole of CH3COCl with the one-NH2 group, the molecular mass increases with 42 units.
the group is 210/42 =5
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Amongst the following the most basic compound is
-
benzylamine
-
aniline
-
acetanilide
-
p-nitroaniline
A.
benzylamine
-NH2 group is not linked to the benzene ring.
An organic compound A upon reacting with NH3 gives B. On heating B gives C. C in presence of KOH reacts with Br2 to give CH3CH2NH2. A is
-
CH3COOH
-
CH3CH2CH2COOH
-
-
CH3CH2COOH
D.
CH3CH2COOH
Consider the acidity of the carboxylic acids
-
PhCOOH
-
p – NO2C6H4COOH
-
o – NO2C6H4COOH
-
m – NO2C6H4COOH
C.
o – NO2C6H4COOH
-NO2 group at any position shows electron withdrawing effect thus acid strength is increased. But o -nitro benzoate ion is stabilised by intramolecular H-bonding. Hence its acid strength is maximum. The effect is more at para position.
Considering the basic strength of amines in aqueous solution, which one has the smallest pKb value?
-
(CH3)2NH
-
CH3NH2
-
(CH3)3N
-
C6H5NH2
A.
(CH3)2NH
Order of basic strength of aliphatic amine in aqueous solution is as follows (order of Kb)
So (CH3)2 NH will have smallest pKb value.
In the case of phenylamine, N is attached to sp2 hybridised carbon, hence it has highest pKb and least basic strength.
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Mock Test Series
Mock Test Series