MCQ
The complexes given below show :


- AOptical isomerism
- BCo-ordination isomerism
- ✓Geometrical isomerism
- DBridged isomerism

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$R - \mathop {\mathop C\limits^{||} }\limits^O - OH\xleftarrow{{{H_3}{O^ + }}}X\xrightarrow{{[H]}}RC{H_2}N{H_2};$
'$X$' is