{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Index of Hydrogen Deficiency (IHD)", "refinement": "This problem involves determining the index of hydrogen deficiency for a specific organic compound after a chemical reaction.", "specific_scope": "The focus is on the product formed from the reaction of 2-formyl-5-vinylcyclohex-3-enecarboxylic acid with red phosphorus and excess HI, which typically leads to the reduction of functional groups and saturation of the compound.", "goal": "Calculate the index of hydrogen deficiency (IHD) of the resulting product to understand its degree of unsaturation."}, "summary": "The problem requires calculating the index of hydrogen deficiency (IHD) for the product formed from the reaction of 2-formyl-5-vinylcyclohex-3-enecarboxylic acid with red phosphorus and excess HI. The IHD is a measure of the degree of unsaturation in a compound, which can be affected by the reduction of functional groups during the reaction. By analyzing the structure of the starting material and considering the effects of the reaction, we can determine the IHD of the final product."}