Q17 of 26 Page 1

(a) Identify the chiral molecule in the following pair ?


(b) Write the structure of the product when chlorobenzene is treated with methyl chloride in the presence of sodium metal and dry ether.


(c) Write the structure of the alkene formed by dehydrohalogenation of 1-bromo-1-methylcyclohexane with alcoholic KOH.

(a) The molecule (i) is chiral molecule.



(b) Chlorobenzene reacts with methyl chloride in the presence of sodium metal and dry ether to give toluene. This reaction is known as Wurtz-Fitting reaction.



(c ) In the 1- bromo -1-methylcyclohexane, all β-hydrogen atoms are equivalent . Thus dehydrohalogenation takes place, in the reaction of this compound with KOH



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15

Write the chemical reactions involved in the process of extraction of Gold. Explain the role of dilute NaCN and Zn in this process.

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Give reasons:

(a) E° value for Mn3+/Mn2+ couple is much more positive than that for Fe3+/Fe2+


(b) Iron has higher enthalpy of atomization than that of copper.


(c) Sc3+ is colourless in aqueous solution whereas Ti3+ is coloured.

 18

(A), (B) and (C) are three non-cyclic functional isomers of a carbonyl compound with molecular formula C 4H 8O . Isomers (A) and (C) give positive Tollen’s test whereas isomer (B) does not give Tollen’s test but gives positive Iodoform test. Isomers (A) and (B) on reduction with Zn(Hg)/conc. HCl give the same product (D).

(a) Write the structures of (A), (B), (C) and (D).


(b) Out of (A), (B) and(C) isomers, which one is least reactive towards addition of HCN?

 19

Write the structure of the main products in the following reactions: