Which of the following is an ortho-and Para-director? Which of the following is

Question

Which of the following is an ortho-and Para-director? Which of the following is a meta-director? Which of the following is a meta-deactivating group? Which of the following is an ortho-and para- director and a deactivator? What is(are) the product(s) when the following substance reacts with Br_2 in the presence of FeBr_3? o-bromotoluene only m-bromotoluene only p-bromololuene only an equimolar mixture of o-bromololuene and p-bromotoluene a mixture of o-bromotoluene (minor) and pbromololuene (major)

Explanation / Answer

1.b -NH2 is an ortho, para director. since -NH2 has a lone pair and behaves as a electron-donating group. Thus, it directs towards the electron deficient centres of the benzene which is ortho and para position.

2.d -COCH3 is a meta director. meta directing groups are electron-withdrawing groups.

3.b -COOH is meta-deactivating group. this is an electron-withdrawing group.

4.b -F is ortho, para director and a deactivator. though fluoride ion is electron donating group but since, it is very electronegative this cause inductive withdrawal.

5.e when toluene reacts with Br2 in the presence of FeBr3 a mixture of o-bromotoluene and p-bromotoluene is obtained. since ortho side is hindered by the alkyl group, therefore, the ortho product is minor and para product is major.

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