Electrophilic substitution reaction in phenol takes place at:

In which of the following,ortho/para substitution by an electrophile is very facile?

Which of the following has the lowest boiling point?

The major product of the following reaction sequence is:
Aniline $\xrightarrow[(i) NaNO_2, HCl, 273-278K]{(ii) H_2O, warm} \text{Product}$ $\xrightarrow[(iv) NaOH]{(iii) Br_2, (excess)} \text{Product}$ $\xrightarrow{(v) CH_3I} \text{Final Product}$

What will be the product of the reaction with $HBr$?

Ortho and para nitrophenols are more acidic than phenol. Draw the resonance structures of the corresponding phenoxide ions.