Kaplan - Pi Bond

[skyisblue]

Kaplan states that: " A pi bond cannot exist independently of a sigma bond. Only after the formation of a sigma bond will the p orbitals of adjacent carbons be parallel, because without the bond the three p orbitals are orthogonal to one another."

I don't get where there are 3 p orbitals and what does orthogonal mean?

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[Sbosu]

Px, Py, and Pz. Orthogonal i think basically means parallel to one another therefore they cannot overlap and form a bond

 

[lor]

Based on my DAT experience:
just know how to count pi bonds/sigma bonds for a given molecule
tripple bond has 2 pi and one sigma
double bond has one sigma and one pi and so on
know that sigma bonds are stronger than pi bonds
know that the energy goes up as the number of bonds go up, exp, you need more energy to break down a tripple bond in comparison to a double bond
tripple bond is SP...180 degree
double bond is SP2...120 degree
single bond is SP3...109.5
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I am not a DAT guru but I'll give you as much as I know