Among the complex ions,
`[Co(NH_(2)-CH_(2)-CH_(2)-NH_(2))_(2)Cl_(2)]^(+),[CrCl_(2)(C_(2)O_(4))_(2)]^(3-),[Fe(H_(2)O)_(4)(OH)_(2)]^(+),[Fe(NH_(3))_(2)(CN)_(4)]^(-),[Co(NH_(2)-CH_(2)-CH_(2)-NH_(2))_(2)(NH_(3))Cl]^(2+)` and `[Co(NH_(3))_(4)(H_(2)O)Cl]^(2+)]`, the number of complex ion (s) that show(s) cis-trans isomerism is

Answer

6

Explanation

`[Co(NH_(2)CH_(2)CH_(2)NH_(2))Cl_(2)]^(+)=[M(A A)_(2)B_(2)]rarr` shows cis-trans isomerism
`[CrCl_(2)(C_(2)O_(4))_(2)]^(3-)=[MA_(2)(BB)_(2)] or [M(A A)_(2)B_(2)]rarr` shows cis-trans isomerism
`[Fe(H_(2)O)_(4)(OH)_(2)]=[MA_(4)B_(2)]rarr` shows cis-trans isomerism
`[Fe(NH_(3))_(2)(CN)_(4)]^(-)=[MA_(2)B_(4)]rarr` shows cis-trans isomerism
`[Co(NH_(2)CH_(2)CH_(2)NH_(2))_(2)(NH_(3))Cl]^(2+)= [M(A A)_(2)BC]rarr` shows cis-trans isomerism
`[Co(NH_(3))_(4)(H_(2)O)Cl]^(2+)=[MA_(4)BC]rarr` shows cis-trans isomerism