C. The compound has a ring, so it has cyclo in the name. Always use the smallest numbers to get to the "extensions" that is where the 3 comes from because the methyl attachment is off of the third bond in the ring.
The Lewis structures in which there are no formal charges is the most stable. Hence, structure (b) is the more stable form of FNO2.
The question is incomplete but I will try to answer you as much as I can. Now the equation is missing hence we can't numerically caculate the enthalpy chnage of the reaction from bond energies. However, we can do this using the formula; Σbond energy of reactants - bond energy of products.
Concerning the Lewis structures of FNO2, the most stable structure is structure (b) as shown in the image attached where the atoms have no formal charges.
<span>Coral is found close to shorelines and it can house many different types of organisms. The structures formed by colonies of coral are called reefs, the best example being the Great Barrier Reef in Australia. Coral is actually composed of the skeletons of dead coral. The coral excrete calcium carbonate, resulting in a hard structure which other organisms occupy. The answer is D.</span>