(Polar molecules, Non-polar molecules, etc.)
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The sigma bond is going to the shortest and closest bond. When you form extra bonds, those electrons can't invade the bond space already occupied by the sigma bond so they have to arch over in order to reach the other atom. Kind of like if you're hugging someone and then another third person joins the hug, they are going to have to arch over the 2 people with their arms since the middle space is already being occupied by the 1st hug.
I believe that after the first bond, pi bonds begin to form. Like it was previously stated, double and triple bonds are formed by overlapping side by side p orbitals. These are pi bonds which can not rotate like sigma bonds can because they are side by side instead of end to end.
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