Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion\[N_{3}^{-}\]is a weaker base than \[NH_{2}^{-}.\] Reason The lone pair of electrons on N atom in \[N_{3}^{-}\]is in a\[s{{p}^{2}}-\]orbital while in \[NH_{2}^{-}\]it is in an \[s{{p}^{3}}-\]orbital.A) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C) If Assertion is true but Reason is false.
D) If both Assertion and Reason are false.
Correct Answer: A
Solution :
Basicity depends upon availability of lone pair of electrons. Since \[\text{N}_{3}^{-}\]is in \[s{{p}^{2}}-\]orbital, its lone pair is less available as compared to \[NH_{2}^{-}\]in which the lone pair is in \[s{{p}^{3}}\]orbital. Thus,\[N_{3}^{-}\] is a weaker base than \[NH_{2}^{-}.\]
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