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 the Reason: is the correct explanation of the Assertion:
B) If both Assertion: and Reason: are true but the Reason: is not the correct explanation of the 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 \[N_{3}^{-}\] is in \[s{{p}^{2}}\]- orbital, its lone pair is less available as compared to \[NH_{2}^{-}\] which is in \[NH_{2}^{-}\]. Thus, \[N_{3}^{-}\] is a weaker base than \[NH_{2}^{-}\]. Hence, Reason: is the correct explanation of Assertion:.
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