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Shreyasi majumdar 1 Best Answer
Since the electronegativity drops down a group, the rings become more electron rich down a group and hence the ring current increases (primary deshielding effect). Since Fe is at the top of the group, it will be most shielded. Due to pi- acid nature of CO ligand, compound A will be most deshielded among the given compounds, and also, there is only one Cp ligand, hence lesser ring current