12th Class Chemistry Sample Paper Chemistry Sample Test Paper-3

  • question_answer   (a) Why are haloarenes less reactive than haloalkanes towards nucleophilic substitution reaction?                                                                                                                                                                                                                                                                                        1 (b) Why is used during the reaction of alcohols with in the conversion of an alcohol to the alkyl bromide?                                                                                                                                                                                            1


                      (a) Haloarenes are less reactive towards nucleophilic substitution because the benzene ring in haloarene is                 electron rich, also it withdraws electrons from chlorine. Hence benzene becomes more rich in electrons and                 favor electrophiles to attack it in comparison to nucleophilic attack is easy.                                                                                                                                                        (b) being a stronger nucleophile than , the later cannot displace the former.protonates ROH' to form being a weaker nucleophile than , it is easily displaced by latter.           1                                                                             


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