Which of the following represents a racemic mixture?
(a) 75% (R)-2-butanol, 25% (S)-2-butanol
(b) 25% (R)-2-butanol, 75% (S)-2-butanol
(c) 50% (R)-2-butanol, 50% (S)-2-butanol
(d) none of the above
(a) 75% (R)-2-butanol, 25% (S)-2-butanol
(b) 25% (R)-2-butanol, 75% (S)-2-butanol
(c) 50% (R)-2-butanol, 50% (S)-2-butanol
(d) none of the above