The infra-red stretching frequency vco of P-S follows the order:
\((P) Mn(CO)_6^+\\ (Q) CO\\ (R) H_3B.CO\\ (S) [V(CO)_6]^-\)

1
\(P>R>S>Q\)
2
\(S>P>R>Q\)
3
\(Q>S>P>R\)
4
\(R>Q>P>S\)

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