Chemistry
Assertion (A): The brown colour of bromine fades when it is added to ethylene.
Reason (R): Ethylene shows substitution reactions.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Organic Chemistry
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Answer
A is true but R is false.
Explanation— When a few drops of a bromine solution in carbon tetrachloride are added to ethylene (ethene), the reddish-brown colour of bromine disappears because bromine adds across the carbon–carbon double bond. Hence, the assertion (A) is true.
Ethylene is an alkene and characteristically undergoes addition reactions, not substitution reactions. Hence, the reason (R) is false.
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