Question:

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion (A) : Trans-2-butene on reaction with \(Br _{2}\) gives meso-2,3-dibromobutane.

Reason (R) : The reaction involves \(syn-addition\) of bromine.

In the light of the above statements, choose the correct answer from the options given below

Updated On: Apr 6, 2023
  • If both assertion and reason are true and the reason is the correct explanation of the assertion
  • If both assertion and reason are true and the reason is not the correct explanation of the assertion
  • If assertion is true but reason is false
  • If both assertion and reason are false
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The Correct Option is C

Solution and Explanation

With trans-$2$-butene, the product of $Br_2$ addition is optically inactive due to the formation of symmetric meso compounds.
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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

  1. Saturated hydrocarbons - Saturated hydrocarbons are those compounds where there is a single bond exists between carbon atoms and are saturated with atoms of hydrogen.
  2. Unsaturated hydrocarbons - Hydrocarbons comprises of at least one double or triple bond between carbon atoms are known as unsaturated hydrocarbons.
  3. Aliphatic hydrocarbons - The term denotes the hydrocarbons formed as an outcome of the chemical degradation of fats. Aliphatic hydrocarbons are basically chemical compounds.
  4. 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.