Q23 of 53 Page 1

(i) Write the IUPAC name of the complex [Cr(NH3)4Cl2]Cl.

(ii) What type of isomerism is exhibited by the complex [Co(en)3]3+?


(en= ethane-1,2-diamine)


(iii) Why is [NiCl4]2- paramagnetic but is [Ni(CO)4] is diamagnetic?


(Atomic No: Cr=24, Co=27,Ni=28)


(i) Tetraamminedichloridochromium (III) chloride.


(ii) [Co(en)3]3+ shows Optical isomerism


(iii) In [NiCl4]2- , Cl- acts as weak ligand therefore does not cause forced pairing, thus electrons will remain unpaired hence paramagnetic.


In [Ni(CO)4], CO acts as strong ligand therefore causes forced pairing, thus electrons will become paired hence diamagnetic.


More from this chapter

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21

What are emulsions? What are their different types? Give one example of each type.

 22

Give reasons for the following:

(i) (CH3)3P=O exists but (CH3)3N=O does not


(ii) ) Oxygen has less electron gain enthalpy with negative sign than sulphur.


(iii) H3PO2 is a stronger reducing agent than H3PO3


 24

(a) Draw the structures of major monohalo products in each of the following reactions:


(b) Which halogen compound in each of the following pairs will react faster in SN2 reaction:
(i) CH3Br or CH3I


(ii) (CH3)3C-Cl or CH3-Cl


 25

Account for the following:
(i) Primary amines (R-NH2) have higher boiling point than tertiary amines (R3N)
(ii) Aniline does not undergo Friedel – Crafts reaction.
(iii) (CH3)2NH is more basic than (CH3)3N in an aqueous solution.

OR


Give the structures of A, B and C in the following reactions: