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Haloalkanes and Haloarenes — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryHaloalkanes and Haloarenes1 Mark
MCQ
Which of the following statement is not correct?
  • ✓
    Chlorobenzene is more reactive than benzene towards electrophilic substitution.
  • B
    $\text{C−Cl}$ bond in chlorobenzene is less polar than $\ce{CHCl_3}.$
  • C
    Chlorobenzene is less reactive than $\ce{CHCl_3}.$
  • D
    In chlorobenzene further substitution takes place at ortho and para positions.
✓

Answer

Correct option: A.
Chlorobenzene is more reactive than benzene towards electrophilic substitution.
Chlorine shows two effects $−I \ \&\ +M.$
Due to the $−I$ effect of $Cl$ group, it reduces the electron density of benzene so chlorobenzene is less reactive than benzene for electrophilic substitution reaction.
But due to the $+M$ effect, it is ortho, para directing, and in chlorobenzene further substitution takes place at ortho and para positions.

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