Based on VSEPR theory, what is the expected value of the indicated bond angle in each of the following ions?
(a) C—O—H in CH_3—OH_2^+ (b) C—N—H in CH_3—NH_3^+
(c) O—C—O in CH_3CO_2^− (d) C—O—C in (CH_3)_2OH^+
(a) 109° (b) 109° (c) 109° (d) 109°