MCQ
The compound that is most difficult to protonate is
- A$H-O-H$
- B$H_3C-O-H$
- C$H_3C-O-CH_3$
- ✓$Ph-O-H$

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${P_4} + 10C{l_2}\xrightarrow{\Delta }PC{l_5}$

for the above reaction at $298 K , K _{ c }$ is found to be $3.0 \times 10^{-59}$. If the concentration of $O _{2}$ at equilibrium is $0.040 M$ then concentration of $O _{3}$ in $M$ is ...... .