Benzene is an unsaturated hydrocarbon. an interesting property of benzene is that

It does not undergo the same types of reactions that take place with other unsaturated hydrocarbons. These other substances tend to react very readily with bromine as a test for unsaturation, leaving the reddish-brown substance as a result: benzene, however, is one of the few unsaturated hydrocarbons that does not react with bromine.

Ithink that the answer is b

Reaction involved in present system is :   c12h22o11 + h2o → 2 c6h12o6the reaction system is obeying following rate law:   rate = k[c12h22o11]thus, it is a first order reaction.now, for 1st order reactionrate constant (k) =  given: initial conc. = 3.0 g, final conc. = 2.7 g, t = 2.5 h∴rate constant (k) =  ∴ k = 0.04215 h-1now, for 1st order reaction, half life = 0.693/k = 0.693/0.04215 = 16.4 hthus correct answer is option b