• 2022-10-24
    对甲基苯甲酸中存在的电子效应有: (1)p-π共轭(2)π-π共轭(3)+I效应(4)-I效应(5)σ-p超共轭(6)σ-π超共轭
    A: (1)(2)(3)(4)(5)(6)
    B: (1)(2)(3)(4)(6)
    C: (2)(3)(4)(5)(6)
    D: (1)(2)(3)(4)
    E: (2)(3)(4)(6)