Q2 of 47 Page 1

Why is CH2=CH-CH2-Cl more easily hydrolysed than CH3CH2CH2Cl?

CH2=CH-CH2-Cl more easily hydrolysed than CH3CH2CH2Cl because on hydrolysis of CH2=CH-CH2-Cl, allyl carbocation is formed i.e. CH2=CH-CH2+ which is resonance stabilized whereas on hydrolysis of CH3CH2CH2Cl, propyl carbocation i.e. CH3CH2CH2+ which is only stabilized by inductive effect. Carbocation is more stabilized by resonance effect thus CH2=CH-CH2-Cl is more easily hydrolysed.


CH2=CH-CH2+ +CH2-CH=CH2


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27

a. Account for the following :

i. Manganese shows maximum number of oxidation states in 3d series.


ii. Eo value for Mn3+/Mn2+ couple is much more positive than that for Cr3+/Cr2+.


iii. Ti4+ is colourless whereas V4+ is coloured in an aqueous solution.


b. Write the chemical equations for the preparation of KMnO4 from MnO2. Why does purple colour of acidified permanganate solution decolourise when it oxidises Fe2+ to Fe3+?


OR


a. Write one difference between transition elements and p-block elements with reference to variability of oxidation states.


b. Why do transition metals exhibit higher enthalpies of atomization?


c. Name an element of lanthanoid series which is well known to shown +4 oxidation state. Is it a strong oxidising agent or reducing agent?


d. What is lanthanoid contraction? Write its one consequence.


e. Write the ionic equation showing the oxidation of Fe(II) salt by acidified dichromate solution.


 1

Write IUPAC name of the complex K3[Cr(C2O4)3].

OR


Using IUPAC norms write the formula of Hexaamminecobalt(III) sulphate.


 5

Arrange the following in increasing order of their boiling point:

CH3CH2OH, CH3CHO, CH3-O-CH3


 8

Complete and balance the following equations-

(a) S + H2SO4 (conc.)


(b) PCl3 + H2O


OR


Write balanced chemical equations involved in the following reactions-


(a) Chlorine gas reacts with cold and dilute NaOH.


(b) Calcium phosphide is dissolved in water.