What is the most proper name of the following ether? OCH3 a. (25,3R)-2-methoxy-3-methylpentane b. (25,3R)-4-methoxy-3-methylpentane C. (25,3S)-2-methoxy-3-methylpentane d. (2R,3R)-4-methoxy-3-methylpentane e. (R)-2-methoxypentane What is the most proper name of the following ether? a. (Z)-1-methoxy-2,4-dimethylpent-2-ene b. (E)-1-methoxy-2,4-dimethylpent-2-ene C. (Z)-4-ethoxy-2,2-dimethylpent-3-ene d. (Z)-2-ethoxy-4,4-dimethylpent-2-ene e. 1-proxyethyl-2,2-dimethylhexene What is the most proper name of the following epoxide? a. (R)-2,3-oxiryl-3,3-dimethylpentane b. (R)-3,3-dimethyl-2-ethyloxirane C. (S)-3-propyl-1,2-dimethyloxirane d. (R)-3-ethyl-2,2-dimethyloxirane e. (S)-3-ethyl-2,2-dimethyloxirane