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- See the two reactions below that can be used to make alkylbenzenes. Name one disadvantage for each reaction.use chemical equations for each steps to synthesize the compound from benzeneCH2 H3C H3C COOH Reagents e. PB13 f. NaCN then H3O* g. NBS, CCI4 h. CrO3, H2SO4 а. HBr b. Mg, ether c. CO2, ether then H3O* d. BH3, THF then H2O2, OH"