Q10 of 26 Page 1

Write the structural formula of A, B, C and D in the following reactions:


A CH3CH=CH2 (- elimination reaction)


B CH3CH2CH2Br (addition of HBr according to anti-Markonikov’s rule)


C CH3CH2CH2I (Finkelstein reaction)


D CH3CH2CH2MgI (formation of Grignard’s reagent)


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8

Account for the following:

(a) The 2 oxygen- oxygen bond lengths in ozone molecule are identical.


(b) PbCl4 is more covalent than PbCl2.


OR


Xenon does not form fluorides such as XeF3 and XeF5. Why?


 9

What are alloys? Name an important alloy which contains some of the lanthanoid metals. Mention its important use.

 11

3.9 g of benzoic acid dissolved in 49 g of benzene shows a depression in freezing point of 1.62 K. Calculate the Vant Hoff factor and predict the nature of solute (Associated or dissociated). Given molar mass of benzoic acid=122 g/mol, Kf (Benzene) = 54.9 K kg/mol.

 12

The molar conductivity of 0.025 mol/L methanoic acid is 46.1 Scm2mol-1. Calculate the degree of dissociation and dissociation constant. Given (H+)= 349.6 Scm2mol-1 and (HCOO-)= 54.6 Scm2mol-1.