I have been studying alkanes, alkenes & alkynes for a while, and I see in the examples that all the basic structural formulas start with $\ce{CH3}$, then $\ce{CH2}$, and the last carbon atom is $\ce{CH3}$, but the one that is attached to the single/double/triple bond is $\ce{CH}$. (Please correct me if I'm explaining it with the right terms.)
Anyways, there's a question about drawing the structural formula for compounds.
Draw a structural formula for hex-3-ene.
What my answer is:
$$\ce{CH3CH2CH=CHCH2CH3}$$
I thought this was right, then I looked at the solutions and it was
$$\ce{H3CCH2CH=CHCH2CH3}$$
So now my question is, why does it start with $\ce{H3C}$ not $\ce{CH3}$ like some other examples?