Which of the following happens during a chemical reaction?
2 answers:
Answer: Option (c) is the correct answer.
Explanation:
A chemical reaction is defined as the reaction that leads to formation of new substances through exchange of electrons.
For example,
Here, aluminium on displacing copper from copper chloride leads to the formation of a new compound, that is, aluminium chloride.
Hence, it shows that atoms of reactant molecules rearrange themselves to form new substances.
Thus, we can conclude that during a chemical reaction atoms of reactants rearrange to form new substances .
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Here we have to explain and predict the product of the reaction between hept-3-yne and bromine (Br₂)
The reaction between hept-3-yne and bromine produces <em>trans</em>-3,4-dibromo-3-heptene.
The reaction between the unsaturated hydrocarbon with halogen remove the unsaturation in the molecule and produces di halo compound. The reaction proceed through the formation of bromonium ion.
In this reaction as the unsaturation present in the middle of the alkyl chain i.e. hept-3-yne. The reaction will stop after the formation of di-halo compound with one double bond as shown in the figure.
The product will be exclusively trans product as the bromine is a bulky group and the formation of bromonium ion (intermediate) will be one side of the unsaturated compound.
