Answers First Exam2010

Answers First Exam2010 - CHEMISTRY 4210, Spring 2010 First...

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Page 1 CHEMISTRY 4210, Spring 2010 First Exam: March 4, 2010 Name: _____________________________ SID:__________________ . Which of the reactions listed below would be exothermic? A) H–H ⎯⎯⎯⎯→ 2H· B) H· + CH 3 –H ⎯⎯⎯⎯→ CH 3 –H + C) CH 3 · + CH 3 · ⎯⎯⎯⎯→ CH 3 –CH 3 D) CH 3 · + CH 3 –H ⎯⎯⎯⎯→ CH 3 –H + CH 3 · E) All of the above Ans: C 2. An example of a reaction having an E act = 0 would be: A) Br· + Br–Br ⎯⎯⎯⎯→ Br–Br + Br· B) F· + CH 4 ⎯⎯⎯⎯→ H–F + CH 3 · C) CH 3 · + CH 3 CH 3 ⎯⎯⎯⎯→ CH 4 + CH 3 CH 2 · D) Br· + H–Br ⎯⎯⎯⎯→ H–Br + Br· E) CH 3 · + CH 3 · ⎯⎯⎯⎯→ CH 3 –CH 3 Ans: E 3. Consider the light-initiated chlorination of (S)-2-chlorobutane followed by careful fractional distillation (or separation by GLC) of all of the products with the formula C 4 H 8 Cl 2 . How many fractions (in total) would be obtained and how many of these fractions would be optically active? A) Three fractions total; all optically active B) Four fractions total; three fractions optically active C) Five fractions total; all optically active D) Five fractions total; four fractions optically active E) Five fractions total; three fractions optically active Ans: E
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4. Which of the following combinations of reactants can provide a demonstrable example of anti-Markovnikov addition? A) CH 2 =CHCH 3 + HCl + ROOR B) CH 3 CH=CH 2 + H 2 O + Cl 2 C) CH 3 CH=CHCH 3 + HBr + ROOR D) CH 3 CH 2 CH=CH 2 + HBr + ROOR E) CH 3 CH 2 CH=CH 2 + Br 2 + ROOR Ans: D 5. What sequence of reactions could be used to prepare the compound below from cyclopentane? A) (1)
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Answers First Exam2010 - CHEMISTRY 4210, Spring 2010 First...

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