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Give reasons for the following : (a) C...

Give reasons for the following :
(a) `CN^(-)` ion is known but `CP^(-)` ion is not known
(b) `NO_(2)` dimerises to form `N_(2)O_(4)`

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(a) Carbon and nitrogen atoms have comparable sizes. They can be linked to each other by triple bond to form `C-=overset(Ó©)(N)`: ion in which `p_(pi)-p_(pi)` bonding is possible. However, similar `p_(pi)-p_(pi)` bonding is not possible between carbon and phosphorus atoms because of comparatively large atomic size of phosphorus. Therefore, `C-=overset(Ó©)(P)` : ion does not exist.
(b) `NO_(2)` is an odd electron molecule and has 17 valence electrons (5 due to N and 12 due to two O atoms). Upon diemersation, it changes into a stable `N_(2)O_(4)` molecule with even number of electrons (34).
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