Please explain EVERY step and draw diagrams to explain, I want to learn not just see a solution

For each of the reactions pictured A) Give the Woodward-Hofmann classification. B) Use a frontier molecular orbital analysis to tell whether the reaction is an allowed thermal or photochemical concerted reaction. Ph Ph a) Ph Ph a- X-0 CN CN .CN b) CN H3COC CO2CH3 H3COC CO2CH3 H 38 VY d) . CH3 H3C H CH2OSI(CH3)3 OSI(CH3)3 H3C H,CHEC H H H H