Aliphatic Compounds Containing Nitrogen - Result Question 13

####14. The increasing order of basicity of the following compounds is

।. NH2

III. I. NH

IV.

(2018 Main)

(a) (I) < (II) < (III) < (IV)

(b) (II) < (I) < (III) < (IV)

(c) (II) < (I) < (IV) < (III)

(d) (IV) < (II) < (I) < (III)

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Answer:

Correct Answer: 14. (c)

Solution:

  1. Key Idea Among the given compounds the basic nature depends upon their tendency to donate electron pair.

Among the given compounds in N, Nitrogen is sp2-hybridised. This marginally increases the electronegativity of nitrogen which in turn decreases the electron donation tendency of nitrogen. Thus making compound least basic.

Among the rest NH2 is totally different from others as in this compound lone pair of one nitrogen are in conjugation with π bond i.e. As a result of this conjugation the cation formed after protonation becomes resonance stabilised

This equivalent resonance in cation makes HN¨N¨H2 most basic among all.

Hence, the correct order is

 (II) < (I) < (IV) < (III) i.e. option (c) is correct. 



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