FIM IIF Custom Expression

Hello,

I'm trying to write a custom IIF statement. I want employees according to their Employee Type to be placed in certain groups. I have an example code I wrote up, but it seems to give me an error:

(IIF(Eq(EmployeeType,"Contractor"),"CN=ACCOUNTS",OU=HOU,OU=Groups,DC=FIM-TEST"))

Is this correct?