A `20%` solution of cane sugar having dextrorotation of `34.50` inverted by `0.5 N` lactic acid to at `298 K`. The rotations determined are as follows:
`|{:("Time (min)",0,14.55,111.36,oo),("Rotation",34.50,31.10,13.98,-10.77):}|`
Show that the inverison of sugar is a unimolecular reaction.