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    H3C   H  <  H3C     H      H3C  H       H3C  H
                  H2C      < CH
                                       < H3C C
                               H3C          H3C

    Increasing rate of reaction towards X2
       radicals formed are more stable

    .CH3  <  H3C .         < H3C C. H  <    H3C  C.
                                          H3C
                   CH2         HC
                                          HC
                                  3         3

             Due to hyperconjugation

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