Question:
The correct order of basic strength in aqueous solution is
The correct order of basic strength in aqueous solution is
Updated On: Jun 14, 2022
- $ (CH_{3})_{2}NH > \,CH_{3}NH_{2} >\,(CH_{3})_{3}N $
- $ (CH_{3})_{3}N > \, (CH_{3})_{2}NH >\, CH_{3}NH_{2} $
- $ CH_{3}NH_{2} >\,(CH_{3})_{3}N > \,(CH_{3})_{2}NH $
- $ (CH_{3})_{3}N > \, CH_{3}NH_{2} > \, (CH_{3})_{2}NH $
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The Correct Option is A
Solution and Explanation
In general, the basic strength of amines increases as the number of electron releasing groups ($+I$ showing group like $?CH_{3})$ increases due to more availability of nitrogen to donate its lone pair of electrons. But in aqueous solution, two other factors, i.e., steric effect and solvation effect, also involves
due to which tendency of tertiary $(3^{\circ})$ amines to loose their lone pair of electrons i.e., basicity reduces. Thus, the order of basicity, if the electron releasing group in methyl, in aqueous solution is
$(CH_{3})_{2}NH >\, CH_{3}NH_{2}>\, (CH_{3})_{3}N$
due to which tendency of tertiary $(3^{\circ})$ amines to loose their lone pair of electrons i.e., basicity reduces. Thus, the order of basicity, if the electron releasing group in methyl, in aqueous solution is
$(CH_{3})_{2}NH >\, CH_{3}NH_{2}>\, (CH_{3})_{3}N$
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Concepts Used:
Amines
Amine is a type of compound which is derived from ammonia (NH3). According to Organic chemistry, they are basically classified as the functional groups of the organic nitrogen compounds that contain nitrogen atoms with a lone pair.
Amine - Types
Primary Amines:
It is formed when one hydrogen atom in ammonia is substituted by an alkyl or aromatic group. Amino acids and methyl amine are the best examples that why aromatic amines include aniline.
Secondary Amines:
Amines that have two organic substitutes either alkyl or aryl ones or both and are bound to the nitrogen together with one hydrogen are termed as secondary amines. For Example, Dimethylamine.
Tertiary Amines:
Tertiary Amines are the amines where the nitrogen consists of three organic substitutes. For example, Trimethylamine and EDTA.