Which type of hydrogen is most acidic? A) benzylic B) vinylic C) tertiarry D) secondary E) primary
A) benzylic A hydrogen at the benzylic position is the most acidic because the benzyl group stabilizes the negative charge via resonance when you pull off that hydrogen.
How many moles of electrons will reduce 2 moles of Al3+ to Al? A) 6 moles B) 3 moles C) 2 moles D) 1 mole
A) 6 moles The oxidation number of Al decreaed from +3 to 0, meaning that Al gained 3 electrons. Because we have 2 moles of Al, we need to multiply 3 electrons by 2, for a total of 6 electrons. The chemical equation would be: 2 Al3+ + 6e- -> 2 Al
Which of the following is NOT true regarding mitosis and meiosis? A) Both meiosis and mitosis are preceded by interphase. B) Meiosis produces haploid daughter cells. C) Synapsis of homologous chromosomes occurs during mitosis. D) Mitosis produces 2 daughter cells, and meiosis produces 4 daughter cells.
C) Synapsis of homologous chromosomes occurs during mitosis. Synapsis of homologous chromosomes only occurs during prophase I of meiosis. It does not occur during mitosis. Synapsis is the pairing up of homologous chromosomes to form a tetrad. Synapsis allows for crossover (exchange of genetic material) to occur between nonsister chromatids of a homologous pair.