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Question
Arrange the following in the increasing order of their pKb values:
C6H5NH2, C2H5NH2, C6H5NHCH3
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Solution
Order of pKb values-
C2H5NH2 < C6H5NHCH3 < C6H5NH2
This is simply because +I effect of C2H5 group increases the basicity of amine while -I effect of C6H5 group decreases the basicity of Amine.
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RELATED QUESTIONS
Write the chemical equation involved in the following reaction:
Hoffmann-bromamide degradation reaction
Write the order of reactivity of alkyl halides with ammonia.
Which of the following amines cannot be prepared by Gabriel phthalimide synthesis?
Which of the following reactions does NOT yield an amine?
Given below are two statements labelled as Assertion (A) and Reason (R).
Assertion (A): Alkyl halides are insoluble in water.
Reason (R): Alkyl halides have halogen attached to sp3 hybrid carbon.
Select the most appropriate answer from the options given below:
Amongst the given set of reactants, the most appropriate for preparing 2° amine is ______.
Under which of the following reaction conditions, aniline gives p-nitro derivative as the major product?
(i) Acetyl chloride/pyridine followed by reaction with conc.\[\ce{H2SO4 }\] + conc. \[\ce{HNO3}\].
(ii) Acetic anyhdride/pyridine followed by conc.\[\ce{H2SO4}\] + conc.\[\ce{HNO3}\].
(iii) Dil. HCl followed by reaction with conc.\[\ce{H2SO4}\] + conc.\[\ce{HNO3}\].
(iv) Reaction with conc.\[\ce{HNO3}\] + conc.\[\ce{H2 SO4}\].
Give reasons for the following:
Ammonolysis of alkyl halides is not a good method to prepare pure primary amines.
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Reason: Ammonolysis of alkyl halides produces secondary amines only.
Write a short note on the following:
Ammonolysis
