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9. Amines — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry9. Amines1 Mark
MCQ
The correct order of the basic strength of methyl substituted amines in aqueous solution is
  • ✓
    $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}>\mathrm{CH}_{3} \mathrm{NH}_{2}>\left(\mathrm{CH}_{3}\right)_{3} \mathrm{N} $
  • B
    $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{N}>\mathrm{CH}_{3} \mathrm{NH}_{2}>\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}$
  • C
    $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{N}>\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH} > \mathrm{CH}_{3} \mathrm{NH}_{2}$
  • D
    $\mathrm{CH}_{3} \mathrm{NH}_{2}>\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}>\left(\mathrm{CH}_{3}\right)_{3} \mathrm{N}$
✓

Answer

Correct option: A.
$\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}>\mathrm{CH}_{3} \mathrm{NH}_{2}>\left(\mathrm{CH}_{3}\right)_{3} \mathrm{N} $
a
The order of basic strength in case of methyl substituted amines and ethyl substituted amines in aqueous solution is as follows:

$\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{2} \mathrm{NH}>\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{3} \mathrm{N}>\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{NH}_{2}>\mathrm{NH}_{3}$

$\left(\mathrm{CH}_{3}\right)_{2}\mathrm{NH}>\mathrm{CH}_{3} \mathrm{NH}_{2}>\left(\mathrm{CH}_{3}\right)_{3} \mathrm{N}>\mathrm{NH}_{3}$

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