The compounds benzyl chloride (C6H5CH2Cl), (dichloromethyl) benzene (C6H5CHCl2), and (trichloromethyl)benzene (C6H5CCl3) all undergo nitration more slowly than benzene. The proportion of m-nitro-substituted product is 4% in one, 34% in another, and 64% in another. Classify the substituents -CH2Cl, -CHCl2, and -CCl3 according to each one's effect on rate and regioselectivity in electrophilic aromatic substitution.