Tag: chemistry

Questions Related to chemistry

For the complex $\left[ {{\text{Fe}}{{\left( {{\text{Co}}} \right)} _{\text{3}}}} \right]$ what is wrong:-

chemistry coordination chemistry bonding in metal carbonyls metal carbonyls coordination compounds

  1. It is $\sigma {\text{ - \pi }}$ bonded organometallic compound

  2. In the complex value of x = 6

  3. Int he complex CO is ${\text{\pi }} - {\text{acid}}$ ligand

  4. It is trigonal bipyramidal shape

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Correct Option: A

The strongest -CO bond is present in 

chemistry coordination chemistry bonding in metal carbonyls metal carbonyls coordination compounds

  1. ${\left[ {{\text{Cr}}{{\left( {{\text{CO}}} \right)} _{\text{6}}}} \right]^ + }$

  2. $\left[ {{\text{Fe}}{{\left( {{\text{CO}}} \right)} _5}} \right]\;$

  3. ${\left[ {{\text{V}}{{\left( {{\text{CO}}} \right)} _{\text{6}}}} \right]^{\text{ - }}}$

  4. all have equation

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Correct Option: B

Which of the following statement is correct regarding metal carbonyl?

chemistry coordination chemistry bonding in metal carbonyls metal carbonyls coordination compounds

  1. In ${Mn} _{2}{(CO)} _{10}$ bond order of $Mn-Mn$ is $0$

  2. In ${Fe} _{2}{(CO)} _{9}$ bond order of $Fe-Fe$ is $1$

  3. In $Ni{(CO)} _{4}$, all bond length are same

  4. $Fe{(CO)} _{5}$ is diamagnetic

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Correct Option: D

Which of the following does not have a metal-carbon bond.

chemistry coordination chemistry bonding in metal carbonyls metal carbonyls coordination compounds

  1. ${C} _{2}{H} _{5}MgBr$

  2. $K[Pt({C} _{2}{H} _{4}){Cl} _{2}]$

  3. $Ni{(CO)} _{4}$

  4. $Al{(O{C} _{2}{H} _{5})} _{3}$

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Correct Option: D

Which of the following is correct value of n in ${\text{Cr}}\left( {{\text{CO}}} \right){\text{n}}$

chemistry coordination chemistry bonding in metal carbonyls metal carbonyls coordination compounds

  1. 2

  2. 4

  3. 6

  4. Unpredictable

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Correct Option: A

Which of the following is correct?

chemistry coordination chemistry bonding in metal carbonyls metal carbonyls coordination compounds

  1. $H _{3}PO _{3}$ is dibasic and reducing

  2. $H _{3}PO _{3}$ is dibasic and non-reducing

  3. $H _{3}PO _{4}$ is tribasic and reducing

  4. $H _{3}PO _{3}$ is tribasic and non-reducing

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Correct Option: B

Which of the following organometallic compound

is $\sigma $ and $\pi $ bonded?

chemistry coordination chemistry bonding in metal carbonyls metal carbonyls coordination compounds

  1. $[Fe(\eta ^{5}-C _{5}H _{5}) _{2}]$

  2. $[PtCl _{3}(\eta ^{2}-C _{2}H _{4})]$

  3. $[Co(CO) _{5}NH _{3}]^{2+}$

  4. $Al(CH _{3}) _{3}$

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Correct Option: C
Explanation:

$[PtCl _{3}(\eta ^{2}-C _{2}H _{4})]$ and $[Fe(\eta ^{5}-C _{5}H _{5}) _{2}]$ are pi bonded organometallic compound.

$Al(CH _3) _3$ 
is sigma bonded organometallic compound.
$[Co(CO) _{5}NH _{3}]^{2+}$ is sigma and pi bonded organometallic compound.

Which of the following organometallic compound is $\sigma$ and $\pi$ bonded -

chemistry coordination chemistry bonding in metal carbonyls metal carbonyls coordination compounds

  1. $[Fe(\eta^{5} - C _5H _5) _2]$

  2. $K[PtCl _3(\eta^{2} - C _2H _40]$

  3. $[Co(CO) _5NH _3]^{+2}$

  4. $Fe(CH _3) _3$

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Correct Option: C
Explanation:
Option (C) is correct.
$[Co(CO) _5NH _3]^{+2}$ is $\sigma$ and $\pi$ bonded.
In this organometallic compound,bond between cobalt and $CO$ ligands have both $\sigma$ and $\pi$ character.$\sigma$- bond formation between metal and carbon of $CO$ takes place by overlap of filled bonding $\pi _{2p}$ of $CO$ with an empty metal $d$- orbital.
The 2nd overlap takes place between metal $d$- orbital with an empty antibonding pi orbital of the $CO$ resulting in additional $\pi$- bond between the metal and same $CO$ molecule. 

Which of the following metal(s) form(s) polynuclear carbonyl?

chemistry coordination chemistry bonding in metal carbonyls metal carbonyls coordination compounds

  1. Na

  2. Mg

  3. Mn

  4. Al

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Correct Option: C
Explanation:

Manganese forms poly nuclear carbonyl.  


Polynuclear metal carbonyls are generally found in late transition metals with low formal oxidation states.

Option C is correct.

Which of the following complex ion has least stability ?

chemistry coordination chemistry bonding in metal carbonyls metal carbonyls coordination compounds

  1. $[Co(NH _2) _6]^{2+}$

  2. $[Co(CN) _6]^{3-}$

  3. $[Co(NH _3) _6]^{3+}$

  4. $[Co(CO) _6]^{3+}$

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Correct Option: D
Explanation:

Cobalt with odd atomic number $(=27)$ does not form a monometallic carbonyl compound. Thus, $[Co(CO) _6]^{3+}$ is least stable among the given.