(a) Account for the acidity of alkynes. (b) Explain the mechanism of sulphonation of benzene. ( c ) How will you convert the following : (i) Ethyne to but-2-yne(ii) Propeneto 2, 3-dimethylbutane(iii) Etheneto ethyne.

(a) Account for the acidity of alkynes. (b) Explain the mechanism of s

1.	(a) Account for the acidity of alkynes. (b) Explain the mechanism of sulphonation of benzene. ( c ) How will you convert the following : (i) Ethyne to but-2-yne(ii) Propeneto 2, 3-dimethylbutane(iii) Etheneto ethyne.
Answer» Solution :( c ) (i)`underset("Ethyne")(HC-=CH)overset(2NaNH_(2))toNaC-=CNa overset(2CH_(3)Br)toCH_(3)underset("But-2-yne")(C-="CCH"(3))` (ii) `underset("Propene")(CH_(3)CH=)CH_(2)overset(HBr)toCH_(3)underset(Br)underset(\|)(C)HCH_(3)overset("Na, ETHER")underset("WURTZ REACTION")to underset("2,3-Dimethyl butane")(CH_(3)underset(CH_(3))underset(\|)(C)H-underset(CH_(3))underset(\|)(C)H-CH_(3))` (iii) `underset("Ethene")(CH_(2)=CH_(2))overset(Br_(2),"CCl"_(4))tounderset(Br)underset(\|)(C)H_(2)-underset(Br)underset(\|)(C)H_(2)overset("2 alc. KOH")tounderset("Ethyne")(HC-=CH)`