A) IV < II < I < III
B) 111 < II < I < IV
C) I < II < III < IV
D) II < IV < I < III
Correct Answer: A
Solution :
Reactivity towards cationic polymerisation increases as the stability of the intermediate carbocation increases. The stability of the intermediate carbocations increases in the order. \[{{H}_{3}}C-\overset{+}{\mathop{CH}}\,-COOC{{H}_{3}}<{{H}_{3}}C-\overset{+}{\mathop{CH}}\,-Cl<\]\[C{{H}_{3}}-\overset{+}{\mathop{CH}}\,-C{{H}_{3}}<{{H}_{3}}C-\overset{+}{\mathop{CH}}\,-{{C}_{6}}{{H}_{5}}\] Therefore, reactivity of the corresponding alkenes towards cationic polymerisation increases in the same order. \[{{H}_{2}}C=\underset{IV}{\mathop{CHCOOC{{H}_{3}}}}\,<\underset{II}{\mathop{{{H}_{2}}C=CHCl<}}\,\]\[{{H}_{2}}C=\underset{I}{\mathop{C}}\,HC{{H}_{3}}<C{{H}_{2}}=\underset{III}{\mathop{CH{{C}_{6}}{{H}_{5}}}}\,\]
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