Question

select not important or less important structures. check all that apply.
:oequivddot{c}- ddot{o}:
: ddot{o}-c- ddot{o}:
:oequiv c- ddot{o}:
: dot{o}=c= dot{o}:
none of the above
part 3 of 3

Explanation:

• For the first structure \( :O\equiv\ddot{C}- \ddot{O}: \), carbon has an incorrect valence (it should have 4 bonds, here it has 5 if we count the triple - bond and single - bond).
• For the second structure \( :\ddot{O}-C-\ddot{O}: \), carbon has only 2 bonds (violates the octet rule as carbon needs 4 bonds).
• The third structure \( :O\equiv C-\ddot{O}: \) also has carbon with an incorrect valence (5 bonds if we count the triple - bond and single - bond).
• The fourth structure \( :\dot{O}=C=\dot{O}: \) is the correct Lewis structure for \( CO_2 \) (carbon has 4 bonds, each oxygen has 2 bonds and 2 lone pairs, satisfying the octet rule).

Answer:

First structure \( :O\equiv\ddot{C}- \ddot{O}: \), Second structure \( :\ddot{O}-C-\ddot{O}: \), Third structure \( :O\equiv C-\ddot{O}: \)