IOS: If statements using OR

The following statement compiles fine:

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
 if ([textField ==_telField]) {

}

However, the following statement throws the error: Expected Identifier

 if ([textField ==_telField] || [1==1]) {
}

It throws an identical error if [1==1] is replaced by [textField==_mobField]

Can anyone explain what is going on here and whether it is possible to chain multiple OR conditionals in a row here?

Thanks in advance for any insights.