Aldehydes, Ketones and Carboxylic Acids

Aldehydes, Ketones and Carboxylic Acids

Question

i) Mn Shows the highest oxidation state of +7 with oxygen but with fluorine it shows the highest oxidation state of +4.
ii) Cr2+ is a strong reducing agent.
iii) Cu2+ salts are coloured while Zn2+ salts are white.

b) Complete the following equations:
straight i right parenthesis space 2 MnO subscript 2 space plus 4 KOH space plus straight O subscript 2 space rightwards arrow with increment on top space

ii right parenthesis space Cr subscript 2 straight O subscript 7 superscript 2 minus end superscript space plus 14 straight H to the power of plus space plus 6 straight I to the power of minus space rightwards arrow

Answer

i) Mn Shows the highest oxidation state of +7 with oxygen but with fluorine, it shows the highest oxidation state of +4 because of the ability of oxygen to form multiple bonds with Mn metal.


ii) Cr2+ is strongly reducing in nature. It has a d4 configuration. Cr2+ is a stronger reducing agent because it can lose one of its electrons to become Cr3+ in which the t2g level of d-orbital is half filled and the eg level is empty.which is a more stable configuration.


iii) The electronic configuration of Zn = 3d10 4s2
Zn2+ = 3d10
where as the electronic configuration of Cu = 3d10 4s1

Cu2+ =3d9
In the case of Zn fully filled d orbital is present therefore no d-d transition can be possible in this case and it is colourless.
In the case of copper 3d9 because of d-d transition electrons emits light in the visible range and hence they are coloured compounds.


b)
straight i right parenthesis space 2 MnO subscript 2 space plus 4 KOH space plus straight O subscript 2 space rightwards arrow with increment on top space 2 straight K subscript 2 MnO subscript 4 space plus 2 straight H subscript 2 straight O

ii right parenthesis space Cr subscript 2 straight O subscript 7 superscript 2 minus end superscript space plus 14 straight H to the power of plus space plus 6 straight I to the power of minus space rightwards arrow 2 Cr to the power of 3 plus end exponent space plus 7 straight H subscript 2 straight O space plus 3 straight I subscript 2

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