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  • The correct order of increasing basic nature for the bases <img alt="\mathrm{ N H_{3},C H_{3}N H_{2}\; \; and\; \; (C H_{3})_{2}N H}" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Cmathrm%

The correct order of increasing basic nature for the bases \mathrm{ N H_{3},C H_{3}N H_{2}\; \; and\; \; (C H_{3})_{2}N H}  is

Option: 1

\mathrm{CH_{3}NH_{2}<N H_{3}<(C H_{3})_{2}N H}


Option: 2

\mathrm{\left( CH _{3}\right)_{2} NH < NH _{3}< CH _{3} NH _{2}}


Option: 3

\mathrm{NH _{3}< CH _{3} NH _{2}<\left( CH _{3}\right)_{2} NH}


Option: 4

\mathrm{CH _{3} NH _{2}<\left( CH _{3}\right)_{2} NH < NH _{3}}


Answers (1)

best_answer

Comparision of Basic nature in aliphatic amines in aqueous phase. -

The basic strength of an amine in aqueous medium is determined not only on the basic of +I effect of the alkyl groups attached to the nitrogen atom but also the solvation of alkyl ammonium ion formed by uptake of proton.

Both the  +I  effect and solvation of amine make basic order of amine in aqueous medium as

\mathrm{2\degree>1\degree>3\degree>NH_{3}}

\mathrm{\left ( When \; R=CH_3 \right )}

The order of basic strength of amines is 

\mathrm{NH_{_{3}}< CH_{3}NH_{2}< \left ( CH \right )_{2}NH}

Correct option is 3

Posted by

shivangi.bhatnagar

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