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 CH3 CH2CH2CH2-COOH 
 CH3 CH2CH(Cl)H2-COOH 
 CH3 CH2CH(Cl)CH(F)-COOH
 CH3 CH2CH(F)CH(Cl)-COOH 
 CH3 CH2CH(CH3)CH(Cl) -COOH 
ANS : 3
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