one of the p orbitals overlap by end on overlap and form sigma bond the remaining p orbitals form pie bond by side on overlap. Thus there is no orbital left to form another pie bond.
The p orbital indicated by blue colour cant overlap with the orbital shown with yellow colour. Hence C4 bond is not possible.
Whereas the blue coloured orbital can overlap with the orbital of an other atom, shown with red colour
God has given you one face, and you
make yourself another.
~William Shakespeare
You were born an original. Don't die a copy.
~John Mason
Moderation Team
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