why alkanes, alkenes and alkynes to form a single bond and a double bond and a triple bond?

In the carbon atoms are bonded neighbor three kemukinan, first forming a single bond, double bond and a triple bond. For simplification can be compared Institute unggal occur from orbital s and called sigma bonds in sp3 hybrid orbitals and shapes of molecules tetrahedron with angles 109.50. Compounds with a single bond called saturated hydrocarbons. Hydrocarbons with double bonds occur in p orbitals, and the bond is known as phi bond, the double bond angle changes due to two parallel p orbitals positioned so as to form sp2 orbital (flat triangle) and the angle formed is 1200. Similarly, a triple bond, there are two parallel p orbitals in a position that alter sp orbitals form a (planar form) with the angle 1800. Molecular forms of saturated hydrocarbons and unsaturated shown in Figure below. For the hydrocarbons that have double bonds called unsaturated hydrocarbons.