The base having the highest pK_b value is | vedclass

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Question

(A) The $pK_b$ value is inversely proportional to the basic strength of the compound. Higher $pK_b$ means lower basic strength.Among the given options

Vedclass · Accepted Answer

$NH_3$

Vedclass · Answer

(A) The $pK_b$ value is inversely proportional to the basic strength of the compound. Higher $pK_b$ means lower basic strength.Among the given options,$NH_3$ is the weakest base because alkyl groups are electron-donating ($+I$ effect),which increases the electron density on the nitrogen atom,thereby increasing basicity.In the gas phase,the order of basicity is $(CH_3)_3N > (CH_3)_2NH > CH_3NH_2 > NH_3$.In aqueous solution,the order is $(CH_3)_2NH > CH_3NH_2 > (CH_3)_3N > NH_3$ due to solvation effects and steric hindrance.In both cases,$NH_3$ remains the weakest base,and therefore,it has the highest $pK_b$ value.

The base having the highest $pK_b$ value is

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