JEE CHEMISTRY MCQ: AMINES

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Analyzing +4 | -1

Considering the basic strength of amines in aqueous solution, which one has the smallest

p{K_b}

value?

View answer and explanation

Correct option: A

{(C{H_3})_2}NH

Option A (

{(C{H_3})_2}NH

) is correct because secondary aliphatic amines generally have the smallest

pK_b

value (highest basicity) in aqueous solutions due to a combination of inductive effects and solvation.

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\mathrm{Z}

' in the sequence

{{\text{C}}_6}{{\text{H}}_5}{\text{N}}{{\text{H}}_2}\xrightarrow{{{\text{NaN}}{{\text{O}}_2} + {\text{HCl}}}}{\text{X}}\xrightarrow{{{\text{CuCN}}}}{\text{Y}}\xrightarrow{{{{\text{H}}^ + }/{{\text{H}}_2}{\text{O}}}}{\text{Z}}

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