Out here in the stroma, a bunch of different enzymes use the carbon dioxide molecules and hydrogen ions made during the light dependent phase to assemble sugar fragments which are half of a glucose molecule (just 3 carbon atoms, instead of the 6 required to make a complete glucose molecule).
An alkane, by definition, only has single bonds. Even if your second diagram made sense (it doesn't for the reason above) it would not be an alkane at all because there is a double bond. Alkanes are a functional group. It's called alkil. As a functional group they have the generic formula R(CH2)nH.
An alkyl group is a univalent radical consisting of carbon and hydrogen atoms, with one H atom less than their alkane counterparts. They form homologous series with a general formula of CnH2n+1, while the general formula of the alkanes is CnH2n+2.est Answer: Alkyl groups are substituents that have one less H (hydrogen atom) than the corresponding alkane.