At the end of the reaction you washed the chemicals into a beaker using water. Why was it OK to use water to do this if Grignard reagents are very reactive towards water?

water could be used to wash it since the reaction has ended.

Explanation:

There will be no reaction of water with the Grignard reagent since the reaction has ended, as it is well known that water is a universal solvent for washing of glasswares after experiments but if it is during the reaction it will be more advisable to rinse with alcohol to enhance more accuracy during the experiment

Option (a) is the correct answer.

Explanation:

According to collision theory, more is the number of collisions between the particles of reactants or a substance then more will be the rate of reaction.

Therefore, when we heat the solution then it will take time to heat up and thus, molecules will gain kinetic energy after a few minutes. As a result, collisions will start to occur and eventually rate of reaction will increase.

Whereas when we stir the solution while heating then immediately a disturbance is caused due to which atoms start to move and thus they gain kinetic energy. Therefore, rate of reaction will increase much faster due to stirring while heating.

On the other hand, when solute is dissolved into the solution and if no disturbance is caused then the reaction will be slow in nature as molecules are not colliding rapidly.

Hence, we can conclude that ranks who would fully dissolve the solute, from first to last are as follows.

                        Larry → Jessica → Hunter