question_answer

Consider the following compounds I to IV with respect to their Su2 reactivity with a given nucleophile \[\underset{I}{\mathop{C{{H}_{3}}C{{H}_{2}}Br}}\,\]                     \[\underset{II}{\mathop{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}Br}}\,\] \[\underset{III}{\mathop{{{\left( C{{H}_{3}} \right)}_{2}}CHC{{H}_{2}}Br}}\,\]    \[\underset{IV}{\mathop{{{\left( C{{H}_{3}} \right)}_{3}}CC{{H}_{2}}Br}}\,\] The correct order of decreasing reactivity is -

A) IV>III>II>I  

B)        I>IV>III>II

C) IV>I>II>III  

D)        I>II>III>IV