The strength of an aqueous NaOH solution is most accurately determined by titrating :
(Note : consider that an appropriate indicator is used)

The rate of a certain biochemical reaction at physiological temperature (T) occurs 10⁶ times faster with enzyme than without. The change in the activation energy upon adding enzyme is :

A flask contains a mixture of isohexane and 3-methylpentane. One of the liquids boils at 63^oC while the other boils at 60^oC What is the best way to separate the two liquids and which one will be distilled out first ?

The major product of the following reaction is :