JEE Main & Advanced Sample Paper JEE Main Sample Paper-18

  • question_answer
    Assertion: \[N_{3}^{-}\]is a weaker base than\[NH_{2}^{-}\].
    Reason: The lone pair of electrons on atom in\[N_{3}^{-}\] is in the \[s{{p}^{2}}\text{-}\]orbital while in \[NH_{2}^{-}\] it is in\[s{{p}^{3}}\text{-}\]orbital.

    A)  Both assertion and reason are correct and the reason is correct explanation to assertion.

    B)  Both assertion and reason are correct but reason is not the correct explanation of assertion.

    C)  Assertion is correct but reason is incorrect.

    D)  Assertion is incorrect but reason is correct.

    Correct Answer: A

    Solution :

     Basic strength depends upon the availability of lone pairs of electrons and lone pair of electrons is more easily available in \[NH_{2}^{-}\] than in \[N_{3}^{-}\] as it is present in \[s{{p}^{3}}\] in \[N_{3}^{-}\] and \[s{{p}^{2}}\] in \[N_{3}^{-}\]. Hence, reason is the correct explanation of assertion.


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