2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

a. Double Replacement
b. Single Replacement
c. Decomposition
d. Combustion
e. Synthesis

d. Combustion

To determine the correct answer, we need to analyze the chemical equation given:

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

The equation represents the reaction between ethane (C2H6) and oxygen (O2). It is important to note that the reactants (ethane and oxygen) are being transformed into different products (carbon dioxide and water).

Looking at the reaction, we observe that ethane (C2H6) combines with oxygen (O2). This combination results in the formation of carbon dioxide (CO2) and water (H2O).

In this reaction, ethane acts as a fuel and is being burned in the presence of oxygen. This type of reaction is known as combustion.

Therefore, the answer is (d) Combustion.