The repeating unit of poly(ethylene glycol) ,a commercially important oligomeric liquid that is soluble in both polar and nonpolar liquids,is shown.With what monomer or combination of monomers is the synthesis of PEG begun? 
Definitions:
Sympathetic Nervous System
Part of the autonomic nervous system that prepares the body for physical activity by increasing heart rate, blood flow, and releasing energy stores.
Multiple Approach-Avoidance
A decision-making conflict involving several alternatives, each with positive and negative aspects.
Avoidance-Avoidance Conflict
A psychological conflict that occurs when a person must choose between two equally unattractive options or outcomes.
Approach-Approach Conflict
A decision-making problem between two attractive options.
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