[CX4H3][#6]	Primary carbon
[CX4H2]([#6])[#6]	Secondary carbon
[CX4H1]([#6])([#6])[#6]	Tertiary carbon
[CX4]([#6])([#6])([#6])[#6]	Quaternary carbon
[CX3;$([H2]),$([H1][#6]),$(C([#6])[#6])]=[CX3;$([H2]),$([H1][#6]),$(C([#6])[#6])]	Alkene
[CX2]#[CX2]	Alkyne
[CX3]=[CX2]=[CX3]	Allene
[ClX1][CX4]	Alkylchloride
[FX1][CX4]	Alkylfluoride
[BrX1][CX4]	Alkylbromide
[IX1][CX4]	Alkyliodide