Q17 of 26 Page 1

(a) [Ni(CO)4] possesses tetrahedral geometry while [Ni(CN)4] is square planar. Why?


(b) Write the IUPAC name of K 2[Ni(CN)4l.


(c) Write the hybridization and shape of [Fe(CN)6]3-.


(a) Ni has the atomic no 28. And it has d8 configuration. As, CO is weak ligand, it is unable to cause internal pairing has make bonds with next 4 available orbital that is 1 5s and 3 4p orbital. And have sp3 hybridization and tetrahedral shade. Whereas CN is a strong field ligand and hence cause pairing and use the left vacant d orbital and take next 1 5s and 2 4p orbital. And hence has dsp2 hybridization and square planer shape.


(b) As it is an anionic complex, and have 4 cyano group, the name will be Potassium Tetracyanonickelate(II).


(c) As CN is a strong field ligand, it has the ability to cause internal pairing and use inner d orbital. So it will make inner orbital compound and the hybridization of [Fe (CN)6]3- will be d2sp3. And the shape will be octahedral.


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15

Give reasons for the following:

(a) Zinc and not copper is used for the recovery of metallic silver from complex [Ag(CN)2] .


(b) Alumina is dissolved in cryolite for electrolysis instead of being electrolysed directly.


(c) Zinc oxide can be reduced to metal by heating with carbon but not Cr2O3.


 16

Account for the following:

(a) The highest oxidation state of a metal is exhibited in its oxides or fluorides only.


(b) Transition metals form coloured compounds.


(c) Transition elements form interstitial compounds.


 18

(a) Write the IUPAC name of

(b) Predict all alkenes that would be formed by the dehydrohalogenation of 2-bromopentane.


(c) Arrange the following halides in the order of increasing


SN2 reactivity


CH3Cl, CH3CH2Cl, (CH3)2CHCl


 19

An organic compound (A) having molecular formula C6H6O gives a characteristic colour with aq. FeCl3 solution. When (A) is treated with CO2 and NaOH at 400 K under pressure, (B) is obtained. The compound (B) on acidification gives compound (C) which reacts with acetyl chloride to form (D) which is a popular pain killer. Write the structures of A, B, C and D.