What is the half-life of a first order reaction if time required to decrease concentration of reactant from 1.0 M to 0.25 M is 10 hour?

Which among the following is obtained as major product $$\mathrm{x}$$ in the reaction stated below?

Anisole $$\mathrm{\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{conc.\,{H_2}S{O_4}}^{conc.\,HN{O_3}}}}$$ x

Which among the following statements about ozone depletion is NOT true?

Which free radical initiator is used for polymerization of tetrafluoro ethylene?