`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)

Options

A. 60
B. 30
C. 20
D. 120

Answer

A