JEE Main Chemistry question
Not in JEE Main or NEET syllabus
Each question contains ASSERTION (Assertion) and REASON (Reason). Each question has the 4 choices (a), (b), (c) and (d), out of which ONLY ONE is correct.
Statement 1 (Assertion): Styrene is more reactive than propylene towards cationic polymerization. Statement 2 (Reason): The carbocation resulting from styrene is more stable than that resulting from propylene.
Answer: (A)
Solution
In cationic polymerization, reactivity tracks the stability of the carbocation intermediate formed on protonation of the monomer. The benzylic carbocation from styrene is resonance-stabilized by the adjacent phenyl ring, making it considerably more
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