Which of the following comparisons or contrasts between endergonic and exergonic reactions is false?

• A. Exergonic reactions are non-spontaneous, while endergonic reactions are spontaneous.
• B. Endergonic reactions require energy input to proceed, whereas exergonic reactions release energy.
• C. Endergonic reactions have a positive Gibbs free energy change, while exergonic reactions have a negative Gibbs free energy change.
• D. Endergonic reactions are associated with an increase in free energy, while exergonic reactions are associated with a decrease in free energy.

Answer: (A)

Verified step by step guidance

1. Understand the definitions of endergonic and exergonic reactions. Endergonic reactions require an input of energy to proceed and are non-spontaneous, while exergonic reactions release energy and are spontaneous.
2. Recall the concept of Gibbs free energy change (ΔG). Endergonic reactions have a positive ΔG, indicating that they require energy input, whereas exergonic reactions have a negative ΔG, indicating that they release energy.
3. Consider the spontaneity of reactions. Spontaneous reactions occur without external energy input, which is characteristic of exergonic reactions. Non-spontaneous reactions require energy input, characteristic of endergonic reactions.
4. Analyze the statement: 'Exergonic reactions are non-spontaneous, while endergonic reactions are spontaneous.' This statement contradicts the definitions of endergonic and exergonic reactions.
5. Review the other statements: 'Endergonic reactions require energy input to proceed, whereas exergonic reactions release energy,' 'Endergonic reactions have a positive Gibbs free energy change, while exergonic reactions have a negative Gibbs free energy change,' and 'Endergonic reactions are associated with an increase in free energy, while exergonic reactions are associated with a decrease in free energy.' These statements are consistent with the definitions of endergonic and exergonic reactions.