Consider the following transformation
Cr(CO)x Cr(CO)y(NO)z
If both reactant and product follow EAN rule, then calculate value of x + z - y (where x, y and z are natural numbers).

Question

Consider the following transformation
Cr(CO)x $\rightarrow$ Cr(CO)y(NO)z
If both reactant and product follow EAN rule, then calculate value of x + z - y (where x, y and z are natural numbers).

Prashant Kotian · Accepted Answer

Correct answer: **ANSWER: 5**<BR>SOLUTION: FOR CR(CO)6, $X = 6$. NO IS A 3-ELECTRON DONOR, SO 3 CO LIGANDS CAN BE SUBSTITUTED BY 2 NO LIGANDS, FORMING CR(CO)3(NO)2. HENCE $Y = 3, Z = 2$. VALUE OF $X + Z - Y = 6 + 2 - 3 = 5$.. Step 1: Recall the EAN formula: EAN = Z - (Oxidation State) + 2 * (Coordination Number). For pairs (a), (b), and (c), the metal, oxidation state, and coordination numbers are identical, so their EAN values are identical. Step 2: For option (d): In [Ni(CO)4], Ni is in the 0 oxidation state, so EAN = 28 - 0 + 2 * 4 = 36. In [Ni(CN)4]^2-, Ni is in the +2 oxidation state, so EAN = 28 - 2 + 2 * 4 = 34. Step 3: Since the EAN values of [Ni(CO)4] (36) and [Ni(CN)4]^2- (34) are different, option (d) is the pair with unequal EAN.

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