please help me 19-25

19-20

21-22

23-25

What is the best choice of reagent to achieve the following reaction? LiAlH4 H2SO4 NaOH,H2O K2Cr2O7,H2SO4 Question 20 What is the intermediate in the reaction of ethylbenzene with NBS in the presence of benzoyl peroxide to give 1-bromo-1-phenylethane? Benzylic anion Benzylic cation Benzylic carbene Benzylic radical What is the major organic product obtained from the following reaction? Question 22 What is the major organic product obtained from the following reaction? What is the electrophile in the reaction of benzene with acetyl chloride, CH3COCl,andAlCl5 ? benzene CH3CO2 CH3CmO+ CH3+ Question 24 Which of the following undergoes the most rapid nitration upon treatment with HNO3/H2SO4 ? benzene bromobenzene toluene nitrobenzene Question 25 Which of the following sets of substituents are all ortho/para directing in electrophilic aromatic substitution reactions? CN,NO2,COCH3 Br,OH,COCH3 Cl,OH,CH3 Cl,CH2,CN