Depending on how (and with how many bonds) the carbon atom is attached to other atoms, it can be either sp3 -, sp2 or sp-hybridized. a) What does the word hybridization mean in this context? b) Explain the difference between sp3 -, sp2 and sp hybridizations. c) Give an example of an sp-hybridized carbon atom that is not part of a triple bond. d) When a substitution reaction takes place via the SN1 mechanism, the product is formed as a racemate (racemic mixture) if the central carbon atom is chiral." Justify this statement by accounting for the hybridization of the central carbon atom in the different steps of the reaction mechanism