ok, this works
--
bind 1 "primeweap"
alias primeweap "wcr;wcs"
alias wcr "useweaponclass rifle"
alias wcs "useweaponclass smg"
alias wcm "useweaponclass mg"
alias wch "useweaponclass heavy"

But this doesn't work
--
bind 1 "primeweap"
alias primeweap "wcr;wcs;wcm;wch"
alias wcr "useweaponclass rifle"
alias wcs "useweaponclass smg"
alias wcm "useweaponclass mg"
alias wch "useweaponclass

Could someone help me set this up so when I hit 1 key it switches to the primary weapon I have.

Hmm, so it only works for the SMG and rifle, try putting some breaks in there incase you are asking it to do too much:

alias primeweap "wcr; wcs; wait; wcm; wch"

I know Half-Life dont like too many commands activated at one instance on the same key, mabye this is the same?. Worth a try at least.