Resonance and Formal Charge Practice Test

The structure with the positive charge on the middle carbon is most stable because it makes two double bonds

The structure with the positive charge on an end carbon is most stable because terminal carbocations are always most stable

One resonance structure is invalid because carbon cannot have a positive formal charge

The structure with a triple bond is most stable because it minimizes formal charge

Both resonance structures are equivalent in stability because they have the same octet satisfaction and charge placement