Two Questions.... Which of the following is the strongest acid? A. ClCH2CH2CO2H B. Cl2CHCO2H C. CH3CHClCO2H D. CLCH2CHClCO2H E. CH3CH2CO2H The answer is B. I thought the answer was D because the Chlorine is adjacent to the Carboxylic Acid. Doesn't a Cl adjacent to a COOH make it more acidic??? Anyone know why the answer is B? 2. How many Primary Hydrogens are present in the compound: 2-methyl-pentane The answer is 9. Can someone tell me what a primary H is?? Thanks guys!