MCQ
Which one of the following is the weakest base?
- A$\left(\mathrm{C}_2 \mathrm{H}_5\right)_3 \mathrm{\sim N}$
- B$\left(\mathrm{C}_2 \mathrm{H}_5\right)_2 \mathrm{NH}$
- C$\mathrm{C}_2 \mathrm{H}_5 \mathrm{NH}_2$
- ✓$\mathrm{NH}_3$
✓
Answer
Correct option: D.
$\mathrm{NH}_3$
The $+I$ effect increases with increase in the alkyl group. Therefore the basic strength will be the highest in $\left(\mathrm{C}_2 \mathrm{H}_5\right)_3 \mathrm{\sim N}$ and least in $\mathrm{NH}_3$.
Therefore the decreasing order of basic strength in gas phase will be $\left(\mathrm{C}_2 \mathrm{H}_5\right)_3 \mathrm{N}>\left(\mathrm{C}_2 \mathrm{H}_5\right)_2 \mathrm{NH}>\mathrm{C}_2 \mathrm{H}_5 \mathrm{NH}_2>\mathrm{NH}_3$.
Therefore the decreasing order of basic strength in gas phase will be $\left(\mathrm{C}_2 \mathrm{H}_5\right)_3 \mathrm{N}>\left(\mathrm{C}_2 \mathrm{H}_5\right)_2 \mathrm{NH}>\mathrm{C}_2 \mathrm{H}_5 \mathrm{NH}_2>\mathrm{NH}_3$.
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