The complex which does not exhibit cis-trans isomerism but optically active.

(1) $\left[\mathrm{Zn}{\left(\mathrm{gly}\right)}_2\right]$ = ${\mathrm{sp}}^3$ it does not form geometrical isomer but can exibhits optical isomerism

(2) $\left[\mathrm{Pt}{\left(\mathrm{gly}\right)}_2\right]$ = ${\mathrm{dsp}}^2$

(3) $[\mathrm{Ni}{\left(\mathrm{gly}\right)}_2{]}^0$ = ${\mathrm{dsp}}^2$

(4) $\left[\mathrm{Pd}{\left(\mathrm{gly}\right)}_2\right]$ = ${\mathrm{dsp}}^2$

2,3,4 They can show Geometrical isomerism but not Optical isomerism