question_answer 39)

    Which of the following pairs of ions are isoelectronic and isostructural? (a)                   (b) (c)                    (d)

Answer:

                    (a) Compounds having same value of total number of electrons are known as isoelectronic. For                                             Total number of electrons            Total number of electrons        = 6 + 8 x 3 + 2                           =7+ 8 x 3 + 1        = 6 + 24 + 2                               =7 + 25        = 32              .                             =32 Hence,  and  are isoelectronic. These two ions have similar structure so they are isostructural. Both have triangular planar structure as in both the species carbon and nitrogen are sp2 hybridised. Hence, (a) is the correct choice.