Which of the following have linear structure
I. `SnCl_(2)` II. `BeF_(2)`
III. `SO_(2)` IV `overset(+)NO_(2)`
`C_(2)H_(2)`

Options

A. I, II, IV
B. II, IV V
C. II, III, IV
D. I,IV,V

Answer

B

Explanation

Structure of :
I. ` SnCl_(2)` Sn have 4 valence electrons, which from two sigma `(sigma)` bonds and have one lone pair (lp) of electrons over Sn atom, thus have V-shaped structure .

II . ` BeF_(2) F- Be - F `
Linear Be have two valence electrons bonded with 2F-atoms, thus no lp of electons and have linear structure .
III . ` SO_(2)` Sulphur (S) have six (6) valence electrons, out of which sulphur can form one coordinate sigma, one simple `(sigma)` and one pi ` (pi)` bond with O-atoms having one lp of electrons over sulphur atom .
Thus , ` SO_(2)` have bent structure .

` overset(+)(N)O_(2)` Nitrogen in ` overset(+)(N)O_(2)` have four (4) electrons in its outernost shell, which are involved in
formation of `[O = underset(("Linear"))overset(+)N to O]` one coordinate,
one simple sigma and one ` pi-` bond with O-atoms . It has no lp of electrons over N-atom, thus have linear structure .
V. ` C_(2) H_(2) H - underset(("Linear"))(C -=) C-H`
Carbon has four valence electrons which forms-two sigma bonds with two H-atoms one by each C-atom) and one sigma bond between two C-atoms . It also forms two pi ` (pi) ` bonds between two C-atoms to complete its octate. Thus, has linear structure.
Hence, option (b) [i.e. II, IV and V] is the correct answer .