(a) The insecticide DDT can be prepared by the reaction shown in Fig. P19.60a. Remembering that a protonated aldehyde or ketone is a type of carbocation, and that carbocations are electrophiles, draw a curved-arrow mechanism for this electrophilic aromatic substitution reaction. 

(b) Bisphenol A is used in the manufacture of polycarbonate plastics. (Its carcinogenicity has become a cause for concern.) Bisphenol A is prepared by the acidcatalyzed reaction of acetone with two equivalents of phenol (Fig. P19.60b). Draw a curved-arrow mechanism for this reaction.

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(b) Cl3C-CH=0 + 20 chloral CH3CCH3 + 2 Figure P19.60 20 chlorobenzene -Cl OH H₂O+ H₂SO4 HO- CC13 T -CH- CH3 C- DDT (an insecticide) 3 CH3 bisphenol A -Cl + H₂O -OH + H₂O