(B) : The donar atom of EDTA is - Two $\mathrm{N}$ atom and four $\mathrm{O}$ atom. Ethylene diamine tetraacetic acid
Kerala-CEE-2019
COORDINATION COMPOUNDS
274196
In $\mathrm{Fe}(\mathrm{CO})_{5}$, the $\mathrm{Fe}-\mathrm{C}$ bond possesses
1 ionic character
2 $\sigma$ - character only
3 $\pi$ - character
4 both $\sigma$ and $\pi$ characters
Explanation:
(D) : $\mathrm{In} \mathrm{Fe}(\mathrm{CO})_{5}$, the $\mathrm{Fe}-\mathrm{C}$ bond possesses both $\sigma$ and $\pi$ character. $\sigma$-bond formed due to donation of $\mathrm{C}$ to $\mathrm{Fe}$
AIIMS 25 May 2019 (Evening)
COORDINATION COMPOUNDS
274198
Which of the following carbonyls will have the strongest $\mathrm{C}-\mathrm{O}$ bond?
1 $\left[\mathrm{Mn}(\mathrm{CO})_{6}\right]^{+}$
2 $\left[\mathrm{Cr}(\mathrm{CO})_{6}\right]$
3 $[\mathrm{V}(\mathrm{CO}) 6]^{-}$
4 $\left[\mathrm{Fe}(\mathrm{CO})_{5}\right]$
Explanation:
(A) : Bond strength of C.O bond $\propto \frac{1}{\text { Back - bonding }}$ Back bonding $\propto$ Electron density of metal $\propto \frac{\text { Negative Charge on metal }}{\text { Positive Charge on metal }}$ If metal having more electron density then it donates more lone pair of electron to carbon atom of $\mathrm{CO}$ group. Metal donate from filled orbital to vacant $\pi^{*}$ orbital of carbon due to which bond strength decreases. Hence, $\left[\mathrm{Mn}(\mathrm{CO})_{6}\right]$ will have the strongest $\mathrm{C}-\mathrm{O}$ bond because here tendency of back bonding is less.
BITSAT-2019
COORDINATION COMPOUNDS
274199
Which of the following ligands can act as an ambidentate ligand?
1 $\mathrm{NO}_{2}^{-}$
2 $\mathrm{Cl}^{-}$
3 $\mathrm{C}_{2} \mathrm{O}_{4}^{2-}$
4 $\mathrm{CN}^{-}$
Explanation:
,d) Exp: (A, D) : Those ligands which has two different donor atoms but at a time only one donor atom is attached with metal. $\mathrm{CN}^{-}$is an example of ambidentate ligand. $\mathrm{M} \longleftarrow \mathrm{CN}$ $\mathrm{M} \longleftarrow \mathrm{NC}$ Cyanido Isocyanido
(B) : The donar atom of EDTA is - Two $\mathrm{N}$ atom and four $\mathrm{O}$ atom. Ethylene diamine tetraacetic acid
Kerala-CEE-2019
COORDINATION COMPOUNDS
274196
In $\mathrm{Fe}(\mathrm{CO})_{5}$, the $\mathrm{Fe}-\mathrm{C}$ bond possesses
1 ionic character
2 $\sigma$ - character only
3 $\pi$ - character
4 both $\sigma$ and $\pi$ characters
Explanation:
(D) : $\mathrm{In} \mathrm{Fe}(\mathrm{CO})_{5}$, the $\mathrm{Fe}-\mathrm{C}$ bond possesses both $\sigma$ and $\pi$ character. $\sigma$-bond formed due to donation of $\mathrm{C}$ to $\mathrm{Fe}$
AIIMS 25 May 2019 (Evening)
COORDINATION COMPOUNDS
274198
Which of the following carbonyls will have the strongest $\mathrm{C}-\mathrm{O}$ bond?
1 $\left[\mathrm{Mn}(\mathrm{CO})_{6}\right]^{+}$
2 $\left[\mathrm{Cr}(\mathrm{CO})_{6}\right]$
3 $[\mathrm{V}(\mathrm{CO}) 6]^{-}$
4 $\left[\mathrm{Fe}(\mathrm{CO})_{5}\right]$
Explanation:
(A) : Bond strength of C.O bond $\propto \frac{1}{\text { Back - bonding }}$ Back bonding $\propto$ Electron density of metal $\propto \frac{\text { Negative Charge on metal }}{\text { Positive Charge on metal }}$ If metal having more electron density then it donates more lone pair of electron to carbon atom of $\mathrm{CO}$ group. Metal donate from filled orbital to vacant $\pi^{*}$ orbital of carbon due to which bond strength decreases. Hence, $\left[\mathrm{Mn}(\mathrm{CO})_{6}\right]$ will have the strongest $\mathrm{C}-\mathrm{O}$ bond because here tendency of back bonding is less.
BITSAT-2019
COORDINATION COMPOUNDS
274199
Which of the following ligands can act as an ambidentate ligand?
1 $\mathrm{NO}_{2}^{-}$
2 $\mathrm{Cl}^{-}$
3 $\mathrm{C}_{2} \mathrm{O}_{4}^{2-}$
4 $\mathrm{CN}^{-}$
Explanation:
,d) Exp: (A, D) : Those ligands which has two different donor atoms but at a time only one donor atom is attached with metal. $\mathrm{CN}^{-}$is an example of ambidentate ligand. $\mathrm{M} \longleftarrow \mathrm{CN}$ $\mathrm{M} \longleftarrow \mathrm{NC}$ Cyanido Isocyanido
(B) : The donar atom of EDTA is - Two $\mathrm{N}$ atom and four $\mathrm{O}$ atom. Ethylene diamine tetraacetic acid
Kerala-CEE-2019
COORDINATION COMPOUNDS
274196
In $\mathrm{Fe}(\mathrm{CO})_{5}$, the $\mathrm{Fe}-\mathrm{C}$ bond possesses
1 ionic character
2 $\sigma$ - character only
3 $\pi$ - character
4 both $\sigma$ and $\pi$ characters
Explanation:
(D) : $\mathrm{In} \mathrm{Fe}(\mathrm{CO})_{5}$, the $\mathrm{Fe}-\mathrm{C}$ bond possesses both $\sigma$ and $\pi$ character. $\sigma$-bond formed due to donation of $\mathrm{C}$ to $\mathrm{Fe}$
AIIMS 25 May 2019 (Evening)
COORDINATION COMPOUNDS
274198
Which of the following carbonyls will have the strongest $\mathrm{C}-\mathrm{O}$ bond?
1 $\left[\mathrm{Mn}(\mathrm{CO})_{6}\right]^{+}$
2 $\left[\mathrm{Cr}(\mathrm{CO})_{6}\right]$
3 $[\mathrm{V}(\mathrm{CO}) 6]^{-}$
4 $\left[\mathrm{Fe}(\mathrm{CO})_{5}\right]$
Explanation:
(A) : Bond strength of C.O bond $\propto \frac{1}{\text { Back - bonding }}$ Back bonding $\propto$ Electron density of metal $\propto \frac{\text { Negative Charge on metal }}{\text { Positive Charge on metal }}$ If metal having more electron density then it donates more lone pair of electron to carbon atom of $\mathrm{CO}$ group. Metal donate from filled orbital to vacant $\pi^{*}$ orbital of carbon due to which bond strength decreases. Hence, $\left[\mathrm{Mn}(\mathrm{CO})_{6}\right]$ will have the strongest $\mathrm{C}-\mathrm{O}$ bond because here tendency of back bonding is less.
BITSAT-2019
COORDINATION COMPOUNDS
274199
Which of the following ligands can act as an ambidentate ligand?
1 $\mathrm{NO}_{2}^{-}$
2 $\mathrm{Cl}^{-}$
3 $\mathrm{C}_{2} \mathrm{O}_{4}^{2-}$
4 $\mathrm{CN}^{-}$
Explanation:
,d) Exp: (A, D) : Those ligands which has two different donor atoms but at a time only one donor atom is attached with metal. $\mathrm{CN}^{-}$is an example of ambidentate ligand. $\mathrm{M} \longleftarrow \mathrm{CN}$ $\mathrm{M} \longleftarrow \mathrm{NC}$ Cyanido Isocyanido
(B) : The donar atom of EDTA is - Two $\mathrm{N}$ atom and four $\mathrm{O}$ atom. Ethylene diamine tetraacetic acid
Kerala-CEE-2019
COORDINATION COMPOUNDS
274196
In $\mathrm{Fe}(\mathrm{CO})_{5}$, the $\mathrm{Fe}-\mathrm{C}$ bond possesses
1 ionic character
2 $\sigma$ - character only
3 $\pi$ - character
4 both $\sigma$ and $\pi$ characters
Explanation:
(D) : $\mathrm{In} \mathrm{Fe}(\mathrm{CO})_{5}$, the $\mathrm{Fe}-\mathrm{C}$ bond possesses both $\sigma$ and $\pi$ character. $\sigma$-bond formed due to donation of $\mathrm{C}$ to $\mathrm{Fe}$
AIIMS 25 May 2019 (Evening)
COORDINATION COMPOUNDS
274198
Which of the following carbonyls will have the strongest $\mathrm{C}-\mathrm{O}$ bond?
1 $\left[\mathrm{Mn}(\mathrm{CO})_{6}\right]^{+}$
2 $\left[\mathrm{Cr}(\mathrm{CO})_{6}\right]$
3 $[\mathrm{V}(\mathrm{CO}) 6]^{-}$
4 $\left[\mathrm{Fe}(\mathrm{CO})_{5}\right]$
Explanation:
(A) : Bond strength of C.O bond $\propto \frac{1}{\text { Back - bonding }}$ Back bonding $\propto$ Electron density of metal $\propto \frac{\text { Negative Charge on metal }}{\text { Positive Charge on metal }}$ If metal having more electron density then it donates more lone pair of electron to carbon atom of $\mathrm{CO}$ group. Metal donate from filled orbital to vacant $\pi^{*}$ orbital of carbon due to which bond strength decreases. Hence, $\left[\mathrm{Mn}(\mathrm{CO})_{6}\right]$ will have the strongest $\mathrm{C}-\mathrm{O}$ bond because here tendency of back bonding is less.
BITSAT-2019
COORDINATION COMPOUNDS
274199
Which of the following ligands can act as an ambidentate ligand?
1 $\mathrm{NO}_{2}^{-}$
2 $\mathrm{Cl}^{-}$
3 $\mathrm{C}_{2} \mathrm{O}_{4}^{2-}$
4 $\mathrm{CN}^{-}$
Explanation:
,d) Exp: (A, D) : Those ligands which has two different donor atoms but at a time only one donor atom is attached with metal. $\mathrm{CN}^{-}$is an example of ambidentate ligand. $\mathrm{M} \longleftarrow \mathrm{CN}$ $\mathrm{M} \longleftarrow \mathrm{NC}$ Cyanido Isocyanido
