Does the fact that a molcule is a primary, seconadary, tertiary,etc carbon really matter if it is given that the octet is complete for the carbon? (“Primary” etc refers to carbons, not molecules. - GS). Wouldnt the formal charge always just be zero for carbon if the octet is complete? (No. It is zero when carbon forms 4 covalent bonds and in some other cases, such as free radical and carbene. - GS).