Draw the product that valine forms when it reacts with excess CH3CH2OH and HCl followed by a wash with aqueous base. You do not have to consider stereochemistry. Do not draw organic or inorganic by-products. Draw the product in neutral form unless conditions are clearly designed to give an ionic product. Include cationic counter-ions, e. g., Na in your answer, but draw them in their own sketcher. Do not include anionic counter-ions, e. g., I-, in your answer.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.