How many of the following statements is(are) correct? (i) Stability order : [ Mn ( CO ) 6 ]

Question

How many of the following statements is(are) correct?

(i) Stability order : $[Mn (CO)_{6}] < [Mn (CO)_{6}]^{+}$

(ii) Stability order : $[Co (CO)_{4}] < [Co (CO)_{4}]^{-}$

(iii) The formula for the IUPAC name dicarbonyldinitrosyl $Iron (0)$ is $[Fe (CO)_{2} (NO)_{2}]$

(iv) EAN value for Iron in diIron nonacarbonyl is 35

(v) Total number of valence electron on each Co atom is 18 in $[Co (CO)_{4}]^{-}$ .

TestHub · Accepted Answer

(i) Incorrect. [ Mn ( CO ) 6 ​ ] has 17 valence electrons, while [ Mn ( CO ) 6 ​ ] + has 16. Neither obeys the 18-electron rule. (ii) Correct. [ Co ( CO ) 4 ​ ] has 17 valence electrons, while [ Co ( CO ) 4 ​ ] − has 18, making it more stable. (iii) Correct. The formula for dicarbonyldinitrosyl Iron(0) is [ Fe ( CO ) 2 ​ ( NO ) 2 ​ ] . (iv) Correct. EAN for Fe in Fe 2 ​ ( CO ) 9 ​ is 35. (v) Correct. Total valence electrons on Co in [ Co ( CO ) 4 ​ ] − is 18. Therefore, 4 statements are correct.

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