MCQ
The electrophile, $E^+$ attacks the benzene ring to generate the intermediate $\sigma -$ complex. Which $\sigma -$ complex is of lowest energy ?
- A

- B

- C

- ✓







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$CO + \frac{1}{2}{O_2} \to C{O_2};\,\Delta H = Y$
Then the heat of formation of $CO$ is
[Given : $p K _{ a 1}$ and $p K _{ a 2}$ of $H _2 CO _3$ are $6.37$ and $10.32 $, respectively $; \log 2=0.30$ ]
