KEAM 2017 Physics and Chemistry Paper

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Question : 116 of 120
 
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The correct order of increasing reactivity of the following alkyl halides, CH3CH2CH(Br)CH3 (I), CH3CH2CH2CH2Br (II), (CH3)2CCClCH2CH3 (III) and CH3CH2CH2Cl (IV) towards SN2 displacement is
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