Which of the following is a trihydric phenol?

  • A
    Catechol
  • B
    Pyrogallol
  • C
    Resorcinol
  • D
    Quinol

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Which among the following is a dihydric phenol?

Identify product $B$ in the following reaction.
Sodium phenoxide $\xrightarrow[6 \text{ atm}]{CO_2, 398 \text{ K}} A$ $\xrightarrow{H_3O^{+}} B$

Phenol $\xrightarrow[(ii) CO_2 / 140^{\circ}C]{(i) NaOH} A$ $\xrightarrow{H^{+} / H_2O} B$ $\xrightarrow[CH_3COOH, \Delta]{Al_2O_3} C$
In this reaction,the end product $C$ is :

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Which among the following compounds is used as a selective weed killer?

The carbon-oxygen bond in phenol is slightly stronger than that in methanol. Why?

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