Chapter 15: Q1. (page 570)
Question: Classify each radical as Primary , secondary or tertiary carbon radicals .
Short Answer
Answer
a. carbon radical
b. carbon radical
c. carbon radical
d. localid="1648713761224" carbon radical
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Chapter 15: Q1. (page 570)
Question: Classify each radical as Primary , secondary or tertiary carbon radicals .
Answer
a. carbon radical
b. carbon radical
c. carbon radical
d. localid="1648713761224" carbon radical
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Question: Draw the structure of the four allylic halides formed when 3-methylcyclohexene undergoes allylic halogenation with NBS + hν.
Question: Using Mechanism 15.1 as a guide, write the mechanism for the reaction of CH4with Br2 to form CH3 Br and HBr. Classify each step as initiation, propagation, or termination.
Questions: Why is a benzylic C-H bond unusually weak?
Question: What alkane is needed to make each alkyl halide by radical halogenation?

Question: The triphenylmethyl radical is an unusual persistent radical present in solution in equilibrium with its dimer. For 70 years the dimer was thought to be hexaphenylethane, but in 1970, NMR data showed it to be A.

a. Why is the triphenylmethyl radical more stable than most other radicals?
b. Use curved arrow notation to show how two triphenylmethyl radicals dimerize to form A.
c. Propose a reason for the formation of A rather than hexaphenylethane.d. How could 1 H and 13C NMR spectroscopy be used to distinguish between hexaphenylethane and A?
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