How do I write organic structural formulas on MS Word 2007 showing three or four Carbon bonds (for eg. Structural formula of CH4 or CH3 OH)
Not sure what you need, but you could try looking at the Equation Editor. On my Word 2007 it is under Insert, Symbols.
When you select Equation it will open a Window on the side,
at the bottom you can select Insert New EquationSelecting the new equation opens up a whole new ribbon with everything you should need to write your equations.