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. ..1111 Ph a) Ph Ph a- X-6 CN CN .CN b) CN H2CO, CO2CH3 H3COC CO2CH3 H d) H CH3 , H CH OSI(CH3)3 OSI(CH3)3 H2CH3C H H H H