Name the products formed and write an equation when ethyne is added to the following in an inert solvent :
(a) chlorine, (c) iodine,
(b) bromine, (d) hydrogen.
(e) excess of hydrochloric acid.

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Solution

(a) Ethyne in an inert solvent of carbon tetrachloride adds chlorine to change into 1,2- dichloro ethene with carbon-carbon double bond, and then to an 1,1,2,2-tetrachloro ethane with carbon-carbon single bond.

$C H \equiv C H + C l_{2} I n e r t s o l v e n t C C l_{4} - ---------- \to C H C l = C H C l + e x c e s s C l_{2} 1, 2 - D i c h l o r o e t h e n e \to C H C l_{2} - C H C l_{2} 1, 1, 2, 2 - T e t r a c h l o r o e t h a n e$

(b) Ethyne in an inert solvent of carbon tetrachloride adds bromine to change into 1,2-dibromo ethene and then to 1,1,2,2 -tetrabromo ethane .
$C H \equiv C H + B r_{2} I n e r t s o l v e n t C C l_{4} - ---------- \to C H B r = C H B r + e x c e s s B r_{2} 1, 2 - D i b r o m o e t h e n e \to C H C l_{2} - C H C l_{2} 1, 1, 2, 2 - T e t r a b r o m o e t h a n e$

(c) Iodine reacts slowly in the presence of alcohol to form 1,2-di-iodo ethene.

$C H \equiv C H + I_{2} I n e r t s o l v e n t C C l_{4} - ---------- \to C H I = C H I 1, 2 - D i i o d o e t h e n e$

(d) In the presence of nickel, platinum or palladium ethyne change to ethene and then to ethane.

$C H \equiv C H + H_{2} P d / C - -- \to C H_{2} = C H_{2} + H_{2} R a n e y - N i - ----- \to C H_{3} - C H_{3}$

(e) excess of hydrochloric acid

$C H \equiv C H + H C l I n e r t s o l v e n t C C l_{4} - ---------- \to C H_{2} = C H C l C h l o r o e t h e n e e x c e s s H C l - --------------- \to S l o w / M a r k o v n i k o v^{'} s r u l e C H_{3} - C H C l_{2} 1, 1 - D i c h l o r o e t h a n e$

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Name the products formed and write an equation when ethyne is added to the following in an inert solvent : (a) chlorine, (c) iodine, (b) bromine, (d) hydrogen. (e) excess of hydrochloric acid.

Name the products formed and write an equation when ethyne is added to the following in an inert solvent :
(a) chlorine, (c) iodine,
(b) bromine, (d) hydrogen.
(e) excess of hydrochloric acid.