Select the reagents you would use to synthesize the compounds below from benzene. Use the minimum number of steps. No more than three steps are required in any synthesis. List the letters of the reagents in the order that they are used; example: fa. Reagents Available a. Br2, FeBr3 b. Cl2, FeCl3 c. HNO3, H2SO4 d. CH3CI, AICls f. KMnO4, H20 g. Fe, H30, then OH p-chloroacetophenone 2,4,6-tribromoaniline: da

See answer below

Explanation:

According to this, we need to synthetize two products from benzene.

To get the p-chloroacetophenone, you may say that just using CH3COCl/AlCl3 and then, Cl2/FeCl3 would be enough right? yes and no. You have to use those reagents but not in that order, This is because the group CH3-CO- is deactivating the molecule, and so, when the chlorine enters, it will do it in the meta position and not the para position. So, we have to use chlorine first, and, in spite of the fact that chlorine is a deactivating group, is orto para director, so, the next step is the use of CH3COCl, and we should get the first product.

To get the second product, we first need to introduce the nitrogen atom in the molecule. We should do a nitration, using HNO3/H2SO4. With that, we have the NO2 in the benzene. Then, we should do a reduction reaction, to get the NH2. In order to do this, we use Fe, H3O+ and OH-. This will reduce NO2 to NH2, and we have aniline. Finally to get the bromine in the three positions, the NH2 is one of the strongest activating group, so, when the bromine reacts, it will attach to all the orto and para positions of the molecule. In this way we can get the 2 products. Picture attached show the products and synthesis.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.