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Elise Z.
Experienced Tutor & College Student
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Organic Chemistry
TutorMe
Question:

Which type of hydrogen is most acidic? A) benzylic B) vinylic C) tertiarry D) secondary E) primary

Elise Z.
Answer:

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.

Basic Chemistry
TutorMe
Question:

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

Elise Z.
Answer:

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

Biology
TutorMe
Question:

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.

Elise Z.
Answer:

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.

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