Classify each of the following pericyclic reactions as an electrocyclic, cycloaddition, or sigmatropic reaction. Give the curved-arrow notation for each reaction, and tell how many electrons are involved.

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Q-4 (b) H H H3C-CH-C-CH3 + Ph H₂C CH3 H H ats de I CH3 H CH3 CH3 I HỌC–CH,—C–CH3 + H₂C H₂C. Ph CH3 H H₂C. + CH3