Regents Chemistry Exam August 2025 Question 45 45 Which type of reaction produces ethanol and carbon dioxide from glucose, C6H12O6? (1) addition (2) fermentation (3) substitution (4) polymerization Solution: Organic Reactions Addition: You will recognize an addition reaction by seeing alkene (CnH2n) + X2 (X can be Cl, Br, I or F) on the reactant side. Example: C3H6 + Cl2 → C3H6Cl2 Substitution: You will recognize substitution by seeing alkane ( CnH2n+2) + X2 (X can be Cl, Br,

Regents Chemistry Exam August 2025 Question 44 44 Given the incomplete equation with X representing a missing product: CH4 + Cl2 → X + HCl Which formula represents the missing product, X ? (1) CH4Cl (2) CH4Cl2 (3) CH3Cl (4) CH3Cl2 Solution: All we need to do is add all the elements on the right and left side to see what is missing. On the left we have 1 carbon atom, 4 hydrogen atoms and 2 chlorine atoms. On the right we have one hydrogen atom and 1 chlorine atom. The right s