Which of the following reactions proceeds via a secondary free radical?

  • A
    $CH_3-CH=CH_2 \xrightarrow{HBr} CH_3-CH(Br)-CH_3$
  • B
    $CH_3-CH=CH_2 \xrightarrow[UV \text{ light}]{HBr, R_2O_2} CH_3-CH_2-CH_2Br$
  • C
    $C_6H_6 \xrightarrow{Br_2 / FeBr_3} C_6H_5Br$
  • D
    $CH_3-CH_2-CH_3 \xrightarrow{Br_2, h\nu} CH_3-CH(Br)-CH_3$

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