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Consider three gaseous alkylamines A, B and C or 1°, 2° and 3° respectively. What will be the correct order of their basicity?(a) A > B > C(b) C > B > A(c) B > A > C(d) B > C > AThis question was addressed to me in unit test.I need to ask this question from Amines Chemical Reactions topic in chapter Amines of Chemistry – Class 12

Answer»

Right option is (b) C > B > A

The best explanation: In the gaseous state, the solvation effect is missing and hence the expected order of BASICITY will be 3° > 2° > 1°. This is because as the number of alkyl groups increase, the +I effect STRENGTHENS and more negative charge is accumulated on the N atom. This MAKES the unpaired share mire available for sharing with the proton of the acid.



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