MCQ
Among the following amines, which one has the highest $pK_b$ value in aqueous solution?
- AMethanamine
- B$N, N -$ dimethylaniline
- CEthanamine
- ✓Benzenamine
✓
Answer
Correct option: D.
Benzenamine
$+$Inductive effct increases the electron density on nitrogen thus makes it more basic while $+R$ effect involves the lone pair of $N$ in conjugation thereby reduces its basicity.
Therefore aniline are less basic than alkyl amines and secondary aniline are more basic than aniline.
Highest $pK_b$ means least basic nature
Therefore aniline are less basic than alkyl amines and secondary aniline are more basic than aniline.
Highest $pK_b$ means least basic nature
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
One mole of calcium phosphide on reaction with excess of water gives
At ${25\,^o}C$, the highest osmotic pressure is exhibited by $0.1\,M$ solution of
→Correct match is
→| Complexes | No. of unpaired electron | ||
| $A$ | $[CrF_6]^{-4}$ | $P$ | $5$ |
| $B$ | $[MnF_6]^{-4}$ | $Q$ | $2$ |
| $C$ | $[Cr(CN)_6]^{-4}$ | $R$ | $1$ |
| $D$ | $[Mn(CN)_6]^{-4}$ | $S$ | $4$ |
Consider the following alcohols
→The order of decreasing reactivities of these alcohols towards substitution with $HBr$ is
Two beakers $A$ and $B$ containing pure water and aqueous solution are shown. What will be observed gradually with passage of time ?
→Phenyl isocyanides are prepared from which of the following reactions
Argon was discovered by
Aniline is soluble in which of the following organic reagents?
The heating of phenyl methyl ether with $HI$ produces
→For the reaction $A + 3B \rightarrow 2C + 2D,$ the concentration of $A$ changes from $0.150 \ M$ to $0.0135 \ M$ in $1$ min. The rate of formation of $C$ in $mol/L/s$ is:
→