Which of the following heterocyclics has the lowest pKa value? 
Definitions:
Enabling Legislation
A statute that specifies the name, functions, and specific powers of an administrative agency and grants the agency broad powers for the purpose of serving the public interest, convenience, and necessity.
Administrative Agency
A governmental body with the authority to implement and administer particular legislation, including making regulations, issuing licenses, and enforcing laws.
Statute
A written law passed by a legislative body at the federal or state level.
Administrative Head
The top official in charge of the administration of an organization, overseeing its operations and ensuring adherence to policies and goals.
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