Explanation
For alkyl halides with the same R but different halogen atoms, the order of reactivity towards substitution/ dehydrohalogenation follows the same order, i.e,, R – I > R – Br > R – Cl >R – F.
In SN2 reactions, inversion of configuration occurs Since the reactant and the product are not enantiomers, therefore, the sign of optical rotation may or may not change and hence a single stereoisomer is obtained. Thus, option (4) is correct.
(IV, C6H5Cl,Cl = 31.5%), I (DDT, Cl = 53.7%),
II (C6H6Cl6,Cl = 73.19 %) III (CCl4, CI = 92.2 %)
Since B gives yellow ppt. with AgNO3/ HNO3, B must be C6H5CH2I and hence A is C6H5I.
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