`pm` 2-butanol is optically inactive

AtoB first order reaction A is ooptical active and B is optically inactive. A series of experiment were conducted on a solution of A {:(,"Time",0,60 min,oo),(,"optical rotation",82^(@),77^(@),2^(@)):} assume some imurity is present calculate the otical rotation for 5 hours.) (Given in 1.066=0.064, e^(0.16) =1.17)

From the following compounds which is optically inactive :

trans isomer of the complex [Co(en)_2Cl_2]^+ is optically inactive. Why ?

The hydrolysis of sucrose was studied with the help of calorimeter and following data were {:(,"Collected time (min.)",:0,70,oo),(,"observed rotation (degrees)",:44,16.5,-11):} the time taken when reaction mixture wil be optically inactive ? (Given : In 2=0.7,in 3=1.1, in 5=1.6)

Define Optical activity.

Draw the geometrical isomers of [Pt(NH_3)_2.CI_2] . Which of these is optically active.