Identify the correct decreasing order of basi | vedclass

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(B) In an aqueous solution,the basic strength of amines is determined by a combination of inductive effect,solvation effect (hydrogen bonding),and ste

Vedclass · Accepted Answer

$(CH_3)_2NH > CH_3NH_2 > (CH_3)_3N$

Vedclass · Answer

(B) In an aqueous solution,the basic strength of amines is determined by a combination of inductive effect,solvation effect (hydrogen bonding),and steric hindrance. For methyl-substituted amines,the order of basicity is $(CH_3)_2NH > CH_3NH_2 > (CH_3)_3N$. $1.$ $(CH_3)_2NH$ (secondary amine) is the most basic due to the combined effect of the electron-donating $+I$ effect of two methyl groups and sufficient solvation of the conjugate acid. $2.$ $CH_3NH_2$ (primary amine) is less basic than the secondary amine but more basic than the tertiary amine in aqueous media. $3.$ $(CH_3)_3N$ (tertiary amine) is the least basic among these because the steric hindrance of the three methyl groups prevents effective solvation of the protonated amine by water molecules,which outweighs the inductive effect.

Identify the correct decreasing order of basic strength of methyl-substituted amines in an aqueous solution.

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