Question:
Electrophilic addition reaction is easily given by
Electrophilic addition reaction is easily given by
Updated On: Jul 28, 2022
- acetylene
- ethene
- ethane
- benzene
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The Correct Option is B
Solution and Explanation
Inspite of the fact that the two $\pi$-bonds are present in alkynes, these are less reactive than alkenes towards addition reactions (due to symmetrical cylindrical nature of $\pi$ - electron cloud). Further, alkynes do not show geometrical isomerism due to their linear structure
The $\pi$- electrons of alkynes are more tightly attached to the carbon atoms than $\pi$-electrons in alkene and hence less easily available for addition reactions with electrophiles. As a result, alkynes are less reactive than alkenes towards electrophilic addition reaction. A majority of addition reactions of alkynes are catalysed by heavy metal ions such as $Hg^{2+}$ and $Ba^{2+}$, etc., while no such catalysts are needed in case of electrophilic addition reactions to alkenes
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Concepts Used:
Hydrocarbons
Hydrocarbons can be described as organic compounds that consists only hydrogen and carbon atoms. These compounds are of different types and thereby have distinct natures. Hydrocarbons are colorless gases and are known for discharging faint odours. These have been categorized under four major classes named as alkynes, alkanes, alkenes, and aromatic hydrocarbons.
Types of Hydrocarbons
- Saturated hydrocarbons - Saturated hydrocarbons are those compounds where there is a single bond exists between carbon atoms and are saturated with atoms of hydrogen.
- Unsaturated hydrocarbons - Hydrocarbons comprises of at least one double or triple bond between carbon atoms are known as unsaturated hydrocarbons.
- Aliphatic hydrocarbons - The term denotes the hydrocarbons formed as an outcome of the chemical degradation of fats. Aliphatic hydrocarbons are basically chemical compounds.
- Aromatic hydrocarbons - They are distinguished because of the presence of benzene rings in them. They give away distinct types of aroma. These hydrocarbons comprises of only hydrogen and carbon atoms.