There are also other types of conjugation . " Homoconjugation " is an overlap of two ?-systems separated by a non-conjugating group, such as CH 2.
2.
Unlike other hydrohalic acids, such as hydrochloric acid, hydrogen fluoride is only a weak acid in water solution, with acid dissociation constant ( pK a ) equal to 3.19 . HF's weakness as an aqueous acid is paradoxical considering how homoconjugation is revealed.