The remaining sp orbital on each atom can form a sigma bond to another atom, for example to hydrogen atoms in the parent acetylene.
22.
A typical double bond consists of one sigma bond and one pi bond; for example, the C = C double bond in ethylene.
23.
A pi bond is weaker than a sigma bond, but the combination of pi and sigma bond is stronger than either bond by itself.
24.
A pi bond is weaker than a sigma bond, but the combination of pi and sigma bond is stronger than either bond by itself.
25.
The existence of specific conformations is due to hindered rotation around sigma bonds, although a role for hyperconjugation is proposed by a competing theory.
26.
The sigma bond between the ring and carboxyl group is then severed, the electron pair moving to the ring and delocalized through resonance structures.
27.
Another is a sigma bond metathesis involving the formation of the M-C bond and a H-Cl or H-O bond.
28.
A sigmatropic rearrangement is a reaction in which a sigma bond moves across a conjugated pi system with a concomitant shift in the pi bonds.
29.
Among the five bonds present between the metal centers, one is a sigma bond, two are pi bonds, and two are delta bonds.
30.
Electron removal generally happens in the following order : 1 ) lone pair electrons, 2 ) pi bond electrons, 3 ) sigma bond electrons.
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