MCQ
Which of the following is the strongest $o,p-$ directing group?
- ✓$OH$
- B$Cl$
- C$Br$
- D$C_6H_5$
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$(a)$ Heat of combustion reaction
$(b)$ Heat of formation reaction
$(c)$ An exothermic reaction
$(d)$ Not neutralization reaction
Reason : Addition of $HBr$ on $2-$ butene follows Markovnikov rule.