1. Which one of the mononuclear carbonyls does not obey EAN rule?
(a) Fe(CO),
(6) V(CO)
(c) Ni(CO)
(d) Cr(CO).
Answers
Answer:
(b). V(CO)
Explanation:
The V(CO) mononuclear carbonyls does not obey EAN rule.
Hence the correct option is (b).
V(CO)₆ does not obey the EAN rule. thus option (b) is the correct answer
EAN rule is also known as the effective atomic number rule
Explanation:
The EAN can be determined with this formula
EAN =Z-x+2nl
where :-
Z is the atomic number of the metal in the complex
x is the oxidation state of the metal in the complex
n is the number of ligands.
a) Fe(CO)₅
EAN=26−0+10=36. Thus, it follows the EAN rule.
b) V(CO)₆
EAN=23−0+12=35. Thus, it does not follow the EAN rule.
c) Ni(CO)₄
EAN= [ 28 - 0 + 2 × 4 × 1 ] = 28 + 8= 36. Thus, it follows EAN rule.
d) Cr (CO)₆
EAN=24-0+12=36. Thus, it follows the EAN rule.
V(CO)₆ does not obey the EAN rule. thus option (b) is the correct answer