The correct name for the complex ion [CoCl(ONO)(en)2]+ is :
(1) chlorobis(ethylenediamine)nitrito-O-cobaltate (III) ion
(2) chlorodiethyldiaminenitrito-O-cobalt (III) ion
(3) chloronitrito-O-diethyldiamine cobaltate (III) ion
(4) chlorobis(ethylenediamine)nitrito-O-cobalt (III) ion