List - I Type of complex List - II The change in number of stereoisomer by the associated process with the given complex (P) [ M ( AB ) 2 ab ] n ± − a / + b (1) 2 (Q) [ Ma 2 b 2 c 2 ] n ± −

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List - I Type of complex List - II The change in number of stereoisomer by the associated process with the given complex (P) [ M ( AB ) 2 ​ ab ] n ± − a / + b ​ (1) 2 (Q) [ Ma 2 ​ b 2 ​ c 2 ​ ] n ± − b , − c / + a , + d ​ (2) 6 (R) [ M ( AA ) 2 ​ a 2 ​ ] n ± − a / + c ​ (3) 3 (S) [ M ( AB ) a 3 ​ b ] n ± − a / + b ​ (4) 1 (5) 0 The correct option is :

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(P) The complex [ M ( A B ) 2 ​ ab ] has 5 stereoisomers. Replacing a with b forms [ M ( A B ) 2 ​ b 2 ​ ] with 2 stereoisomers, resulting in a change of ∣5 − 2∣ = 3 ( P → 3 ). (Q) The complex [ M a 2 ​ b 2 ​ c 2 ​ ] has 5 stereoisomers. Undergoing the process gives [ M a 3 ​ b c d ] with 4 stereoisomers, resulting in a change of ∣5 − 4∣ = 1 ( Q → 4 ). (R) The complex [ M ( AA ) 2 ​ a 2 ​ ] has 3 stereoisomers. Replacing one a with c gives [ M ( AA ) 2 ​ a c ] , which also has 3 stereoisomers, resulting in a change of ∣3 − 3∣ = 0 ( R → 5 ). (S) The complex [ M ( A B ) a 3 ​ b ] has 4 stereoisomers (2 fac, 2 mer). Replacing one a with b forms [ M ( A B ) a 2 ​ b 2 ​ ] with 6 stereoisomers, resulting in a change of ∣4 − 6∣ = 2 ( S → 1 ).

List - I Type of complex	List - II The change in number of stereoisomer by the associated process with the given complex
(P) $[M (AB)_{2} ab]^{n \pm} - a / + b$	(1) 2
(Q) $[Ma_{2} b_{2} c_{2}]^{n \pm} - b, - c / + a, + d$	(2) 6
(R) $[M (AA)_{2} a_{2}]^{n \pm} - a / + c$	(3) 3
(S) $[M (AB) a_{3} b]^{n \pm} - a / + b$	(4) 1
	(5) 0

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