Consider the structure of the phosphonium ylide formed by treatment of the following haloalkane with triphenylphosphine followed by butyllithium.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

po-215 i got it right on the quiz

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.