Explanation
Substitution.
Aniline
I and II pairs are correctly matched while III and IV are not.
DDT.
Weaker the C – X bond, greater is the reactivity, i.e., RI > RBr > RCI > RF.
MeX; as the steric hindrance at the α − carbon, i.e., carbon attached to X increases the reactivity of the alkyl halide towards SN2 reaction decreases. Therefore MeX is more reactive.
Reactivity decreases in the order : allylic >2o > 1o halides. Therefore, option (3) is correct.
racemic mixture.
CH3 group in toluene is o, p – directing, i.e, o – and p – chlortoluene is obtained.
Saytzeff rule applies here and hence a mixture of 1 – butene and 2 – butene is obtained out of which 2 – butene is the major product.
Only diethyl ketone, i.e., CH3CH2COCH2CH3 does not contain the grouping CH3CO– or CH3CHOH– and hence does not give iodoform test.
CH3OH does not give iodoform reaction.
NO2 group withdraws electrons from o-and p-positions and hence activates the Cl towards nucleophilic substitution reactions.
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