Short Answer Type
Long Answer TypePredict the order of reactivity of the following compounds in SN1 and SN2 reactions:
(a) The four isomeric bromobutanes.
(b) C6H5 H2Br, C6H5CH (C6H5Br, C6H5CH (CH3)Br, C6H5C(CH3)(C6H5)Br.
Short Answer TypeWhy (-NO2) group shows its effect only at ortho- and para-position and not at meta–position?
Presence of nitro group at ortho- and para-positions withdraws the electron density from the benzene ring and thus facilitates the attack of the nucleophile on haloarene. The carbanion thus formed is stabilised through resonance. The negative charge appeared at ortho- and para- positions with respect to the halogen substituent is stabilised by –NO2 group.
Long Answer TypeShort Answer TypeExplain the reason:
The reactivity order of alkyl bromides is tert alkyl bromide > sec alkyl bromide > primary alkyl bromide.
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