详细讲解一下这道化学题，如果有化学反应相关的动画演示更好---The extracted content from the image is as follows: **Overall Context:** 19. (14分) Aromatic compounds containing a furan skeleton are of important value in the fields of environmental chemistry and materials science. A synthesis route for an aromatic compound containing a furan skeleton is as follows: **Synthesis Pathway Description:** The image displays a multi-step chemical synthesis pathway involving several intermediate compounds (A to H, and M to N). * **Molecule A:** A benzene ring substituted with a hydroxyl (-OH) group and a carboxyl (-COOH) group in an ortho relationship. * **Reaction A → B:** * Reagents: CH3OH, concentrated H2SO4, Δ (heat). * Product B: Chemical formula C8H8O3. Structure: A benzene ring substituted with a hydroxyl (-OH) group and a methyl ester (-COOCH3) group in an ortho relationship. * **Reaction B → C:** * Reagent: LiAlH4. * Product C: Chemical formula C7H8O2. Structure: A benzene ring substituted with a hydroxyl (-OH) group and a hydroxymethyl (-CH2OH) group in an ortho relationship. * **Reaction C → D:** * Reagents: O2, Pt3Pd/C. * Product D: Structure: A benzene ring substituted with a hydroxyl (-OH) group and an aldehyde (-CHO) group in an ortho relationship. * **Reaction D → E:** * Reagents: PPh3, CBr4, base. * Product E: Structure: A benzene ring substituted with a hydroxyl (-OH) group and a dibromomethylene (-CH=CBr2) group in an ortho relationship. * **Reaction E → F:** * Reagents: CuI, K3PO4, Δ (heat). * Product F: Structure: A benzofuran system (a benzene ring fused to a furan ring). The furan ring has a bromine atom at position 2 (adjacent to the oxygen bridgehead) and a phenyl group at position 3. * **Reaction F → G:** * Reagents: Phenylboronic acid (PhB(OH)2, denoted as -B(OH)2 in the diagram), "一定条件" (certain conditions). * Product G: Chemical formula C14H10O. (The structure is not explicitly drawn, but given the formula and the subsequent reaction to H, it's implied to be 3-phenylbenzofuran). * **Reaction G → H:** * Reagents: An N-bromosuccinimide derivative (specifically, 3-bromo-1-oxoisoindoline-2-yl, depicted with a nitrogen atom bonded to a bromine atom, within a five-membered ring containing two carbonyl groups and fused to a benzene ring), and "一定条件" (certain conditions). * Product H: Structure: A benzofuran system. The furan ring has a bromine atom at position 2 and a phenyl group at position 3. Additionally, the benzene ring has another bromine atom at position 7 (para to the furan oxygen's bridgehead). * **Molecule M:** * Structure: A benzofuran system. The furan ring has a phenylethynyl group (-C≡C-Ph) attached at position 2. * **Reaction M → N:** * Reagents: i) ≡-TMS, "一定条件" (certain conditions); ii) K2CO3. Then PtCl2, Δ (heat). * Product N: Structure: A benzofuran system. The furan ring has a phenyl group at position 2 and another phenyl group at position 3. **Questions:** Answer the following questions: (1) The chemical equation for A→B is ______. (2) C→D achieved the transformation from ______ to ______ (fill in functional group names). (3) The reaction type for G→H is ______. (4) Among the isomers of E, the number of isomers containing a benzene ring (without other rings) and with the ratio of hydrogen atoms in different chemical environments being 3:2:1 is ______ species. (5) In the triple bond addition reaction of M→N, if the benzene ring involved in bonding and its reaction position remain unchanged, the structural formula of the byproduct that is an isomer of N is ______. (6) Referring to the above route, design the following transformation. The structural formulas of X and Y are ______ and ______. **Sub-diagram for Question (6):** A three-step synthesis pathway is shown: * **Step 1:** * Starting Material: A fused polycyclic system consisting of a central benzene ring flanked by two thiophene rings, forming a benzo[1,2-b:4,5-b']dithiophene core. This core is substituted with two bromine atoms at positions 3 and 6 (on the thiophene rings). (Specifically, 3,6-dibromobenzo[1,2-b:4,5-b']dithiophene). * Reagents: NaOH, C2H5OH, Δ (heat). * Product: X (structure to be determined). * **Step 2 (X → Y):** * Reagent: An N-bromosuccinimide derivative (3-bromo-1-oxoisoindoline-2-yl, same as in G→H step). * Product: Y (structure to be determined). * **Step 3 (Y → Final Product):** * Reagents: Phenylboronic acid (PhB(OH)2, denoted as -B(OH)2), "一定条件" (certain conditions). * Final Product: A fused polycyclic system identical to the starting material's core (benzo[1,2-b:4,5-b']dithiophene), but with two phenyl groups (-Ph) replacing the bromine atoms at positions 3 and 6. (Specifically, 3,6-diphenylbenzo[1,2-b:4,5-b']dithiophene).