Chemistry - GOC Question with Solution | TestHub
The origin of acidity and basicity in organic compound is great interest and provides an extensive comparison. Among hydrocarbons % s character is taken in account while to decide the acidity, in simple aliphatic acids, more the number of alkyl groups, (+I effect) less is the acidity & more the (– I effect) alkyl groups larger the acidity and vice-versa in the case of simple aliphatic bases. (Benzoic acid is more strong than carboxylic acid as benzoate ion is stabilised more by resonance.) Aromatic amines are less basic than aliphatic amine as the electron pair is less available in case of aromatic amines. The presence of solvent also plays a very important role and at times governs the order too.
The correct increasing order of basic strength for the following compounds is :
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Question Explanation:
Find the order of basic strength of three given substituted aniline compounds.
Concept:
This question is based on Basicity of Amines, Mesomeric and Inductive Effects.
Solution:
The basicity of substituted anilines depends on the availability of the lone pair on the nitrogen atom for donation. Electron-donating groups like –NH2 , -OCH3 , CH3 etc. increase electron density through the +R, +H, +I effects, while electron-withdrawing groups like –NO2 , –CHO, Cl etc. decrease it through –R and –I effects.
