PL explain why-5- The decreasing order of basic strength in nbsp-C6H5NH2- nbsp- -C6H5-2NH- CH3NH2- NH3 is nbsp-a- IV gt-II gt-II gt-I nbsp- nbsp- nbsp- nbsp- nbsp- nbsp- nbsp- nbsp-b- II gt-II gt-III gt-IV-c- III gt-IV gt-I gt-II nbsp- nbsp- nbsp- nbsp- nbsp- nbsp- nbsp- -d- II gt-I gt-III gt-IV

Dear student nbsp; Order of basicity: nbsp; nbsp;CH3 NH2 nbsp; gt; NH2 nbsp; gt; Ph NH2 nbsp; gt; (Ph)2NH Basic strength is the ability to do ...

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Byju's Answer

Standard XII

Chemistry

Aromatic Directive Influence

PL explain wh...

Question

PL explain why?

5. The decreasing order of basic strength in
C₆H₅NH₂, (C₆H₅)₂NH, CH₃NH₂, NH₃ is

(a) IV>II>II>I (b) II>II>III>IV
(c) III>IV>I>II (d) II>I>III>IV

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Solution

Dear student

 Order of basicity:  CH₃-NH₂ > NH₂ > Ph-NH₂ > (Ph)₂NH

Basic strength is the ability to donate the lone pair. Due to Inductive effect by CH₃ electron density on N increases thus lone pair donating tendency increases. When benzene ring is attached to the nitrogen the lone pair of N take part in resonance and is not available the donation, thus low basic strength. In 2 phenyl groups, more resonance is there and hence even lower Basic strength.

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