Question

Which of the following would be produced when acetylene reacts with \[HCl\] ?
A. $C{H_3}C{H_2}Cl$
B. $C{H_3}CHC{l_2}$
C. $CH\left( {Cl} \right) = CH\left( {Cl} \right)$
D. $C{H_2}CHCl$

Answer 1

Hint: We must examine the comprehensive analysis of the reaction between what happens when acetylene reacts with hydrochloric acid in order to answer this question. Acetylene has pi bonds which favors an addition reaction.

Complete step-by-step answer:The chemical substance having the formula \[{C_2}{H_2}\] is acetylene, also known by its scientific name, ethyne. It is the most basic alkyne and a hydrocarbon. This colourless gas is frequently utilised as a fuel and a component of chemical compounds. Since it is unstable in its pure state, a solution is typically used.
When acetylene reacts with hydrochloric acid, electrophilic addition takes place. The two carbon atoms of acetylene are bounded by triple bond between them. On reaction with \[HCl\] , we need to figure out whose electron goes to the other carbon atom because both the sides of carbon have same environment. Let the electron goes to one of the carbons and acquire a negative charge. As a result \[{H^ + }\] forms a bond with it. Also the other carbon acquires a positive charge and chlorine already has a negative charge, so the form a bond with each other. So when acetylene reacts with one mole of hydrochloric acid, we get $C{H_3}CHCl$ as a product. But if it further reacts with hydrochloric acid i.e., if excess of \[HCl\] is used then using Markovnikov rule, we get $C{H_3}CHC{l_2}$ .

Option ‘B’ is correct

Note:The outcome of some addition reactions is described by Markovnikov's rule or in organic chemistry. "Hydrogen is added to the carbon with the most hydrogens and the halide is added to the carbon with the least hydrogens," is one way to put it.