Multiple If statements
Two things:


The else will only be subject to the last if being false, the rest of the if statements are completely separate and can affect the else in no way whatsoever.  To chain them you need if (...) { blah blah } else if (...) { blah blah } etc.
You cannot compare characters and strings like that (and in fact they're not even strings, they're lots of characters squeezed into a single character through the use of the wrong kind of quotes).


So basically no, your whole program there is completely wrong and won't do what you think it will and you need to completely re-thing how it works.

Some tips:


Use strcmp() to compare strings.
If reading strings from serial store them in character arrays not a single character.


You might find this useful:


http://hacking.majenko.co.uk/reading-serial-on-the-arduino
http://hacking.majenko.co.uk/the-evils-of-arduino-strings