1.

In the study of inversion of sucrose in presence of acid, if r_(0),r_(1)" and "r_(oo) represent the polarimetric readings at times 0, t and oo respectively, then at the 50% inversion, which of the following relationship will hold good ?

Answer»

`r_(t)=r_(0)+r_(oo)`
`r_(t)=(1)/(2)(r_(0)+r_(oo))`
`r_(t)=r_(0)-r_(oo)`
`r_(t)=(1)/(2)(r_(0)-r_(oo))`

SOLUTION :Rotation in time `t = (r_(0) -r_(t)) PROP x`
Rotation in time oo = (r_(0) -r_(oo)prop a`
50% inversion means `x = a//2`
i.e. `r_(0) -r_(t) = (r_(0) -r_(oo))/(2) or 2 r_(0) - 2 r_(t) = r_(0) - r_(00)`
or `2 r_(t) = r_(0) + r_(oo)`


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