You have conducted a synthesis reaction which yields a product that is soluble in organic solvents. However, the reaction by-products include both an inorganic salt (KCl) and H2SO4 acid catalyst (which of course was not consumed in the reaction). You need to isolate your product via extraction. Your choices of organic solvents are: isopropanol, diethyl ether, or acetone. Keeping in mind that you will also be doing aqueous washes during the workup, which solvent would you select? Why not the other two?

answer is a

explanation:

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.