Consider the following statements.
(P) Blue salt `K_(4)[Mn(CN)_(6)].3H_(2)O` is isostructural with the hexacyanoferrate (II) and the former complex is paramagnetic but later one is diamagnetic.
(Q) In the series of isoelectronic species `[V(CO)_(6)]^(-), [Cr(CO)_(6)]" and "[Mn(CO)_(6)]^(+)`,from the vanadium to manganese complexes there is reduction in the strength of the bonding between metal and carbon and an increase in that in the carbonyl group (i.e.CO).
(R ) Chlorotritriphenylphosphinerhodium (I) is a square planar diamagnetic complex which is used as a homogeneous catalyst in hydrogenation of alkenes.
(S) Like `[Co(NH_(3))_(4)Cl_(2)]^(+)` ion, `[Co(en)_(2)Cl_(2)]^(+)` ion can exist in cis and trans forms adn neither can display optical activity.
(T) `Ni(CO)_(4)" and "NiCl_(2)(PPh_(3))_(2)` have same hybridization but different, magnetic moment and effective atomic number.

Options

A. P, R and T
B. Q, R and S
C. Q, R and T
D. R, S and T

Answer

A, C

Explanation

(Q) As `e^(-)` density on `Muarr`,M-C bond becomes stronger while C-O bond becomes weaker.
(T) `[overset(+2)NiCl_(2)(PPh_(3)) implies` tetrahedral but `d^(8)` has 2 uu.p. electron. Correct statements : P,Q,R,T.