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Amines — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryAmines1 Mark
MCQ
In the following compounds, the decreasing order of basic strength will be:
  • ✓
    $ \left(\mathrm{C}_2 \mathrm{H}_5\right)_2 \mathrm{NH} > \mathrm{C}_2 \mathrm{H}_5 \mathrm{NH}_2 > \mathrm{NH}_3 $
    ​
  • B
    $ \left(\mathrm{C}_2 \mathrm{H}_5\right)_2 \mathrm{NH} > \mathrm{NH}_3 > \mathrm{C}_2 \mathrm{H}_5 \mathrm{NH}_2 $
  • C
    $ \mathrm{NH}_3 > \mathrm{C}_2 \mathrm{H}_5 \mathrm{NH}_2 > \left(\mathrm{C}_2 \mathrm{H}_5\right)_2 \mathrm{NH} $
  • D
    $ \mathrm{C}_2 \mathrm{H}_5 \mathrm{NH}_2 > \mathrm{NH}_3 > \left(\mathrm{C}_2 \mathrm{H}_5\right)_2 \mathrm{NH} $
✓

Answer

Correct option: A.
$ \left(\mathrm{C}_2 \mathrm{H}_5\right)_2 \mathrm{NH} > \mathrm{C}_2 \mathrm{H}_5 \mathrm{NH}_2 > \mathrm{NH}_3 $
​
$ \left(\mathrm{C}_2 \mathrm{H}_5\right)_2 \mathrm{NH} > \mathrm{C}_2 \mathrm{H}_5 \mathrm{NH}_2 > \mathrm{NH}_3 $​
Basic strength order
$\left(\mathrm{CH}_3 \mathrm{CH}_2\right)_2 \mathrm{NH}>\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{NH}_2>\mathrm{NH}_3$
$2^\circ $ amine$, 1^\circ $ amine
Alkyl group shows $+I$ effect, and hence increases basicity.

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