-ance

comeuppance
independence
reliance

All of them are derivational. On this pattern, it is penult (second to -ance). So, the stress falls on -up- and -pen- and -li- respectively.


askance: /əˈskæns/ -ance in askance is not derivational, but whose origins are:
Origin:
1520–30; earlier a scanche, a sca ( u ) nce; of obscure orig. cf: reference.com