JEE Main 2014 · 6 Apr · Shift 1 · Chemistry Q56

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ChemistrySingle correct+4 / -1Question 56 of 90

Considering the basic strength of amines in aqueous solution, which one has the smallest $pK_b$ value ?

\ce{(CH3)2NH}

\ce{CH3NH2}

\ce{(CH3)3N}

\ce{C6H5NH2}

Answer and worked solution

Official answer: A

The smallest $pK_b$ belongs to the strongest base. In water, inductive effect and solvation together make the secondary amine the strongest:
$\ce{(CH3)2NH > CH3NH2 > (CH3)3N \gg C6H5NH2}.$

Topics:Amines Acidity and basicity

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JEE Main 2014 · 6 Apr · Shift 1, Chemistry question 56