If given compounds obey EAN rule then for which complex value of x

Question

If given compounds obey EAN rule then for which complex value of x < 2 (where x is non zero).

TestHub · Accepted Answer

To find the correct complex, we calculate the value of $x$ using the Effective Atomic Number (EAN) rule, where the total electrons must equal 36 (Krypton):

For (A) Hₓ[Co(CO)₄]: The complex ion is $[C o (CO)_{4}]^{x -}$ , so $E A N = 27 (C o) + x (o x i d a t i o n s t a t e) + 8 (4 \times CO) = 35 + x = 36 ⟹ x = 1$ .

For (B) $[M n (CO) (NO)_{x}]$ : $E A N = 25 (M n) + 2 (1 \times CO) + 3 x (x \times l in e a r NO) = 27 + 3 x = 36 ⟹ x = 3$ .

For (C) $[F e (CO)_{4}]^{x -}$ : $E A N = 26 (F e) + x (o x i d a t i o n s t a t e) + 8 (4 \times CO) = 34 + x = 36 ⟹ x = 2$ .

For (D) $[C r (π - C_{6} H_{6})_{x}]$ : $E A N = 24 (C r) + 6 x (x \times b e n ze n e) = 24 + 6 x = 36 ⟹ x = 2$ .

Since $x = 1$ satisfies the given condition $x < 2$ , the correct option is (A).

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