When phenol is treated with CHCl₃ and NaOH, the product formed is

A capacitor of capacity C₁ charged upto V volt and then connected to an uncharged capacitor of capacity C₂. The final potential difference across each will be

When ultraviolet rays incident on metal plate then photoelectric effect does not occur, it occurs by incidence of

To convert a galvanometer into a voltmeter one should connect a