A-LevelChemistryIntroduction to organic chemistryFeb/Mar 2025Paper 1 Q381 Mark
The diagrams show the structures of two isomeric dicarboxylic acids, X and Y. X can be reduced to compound P with empirical formula C2H5O. Y can be reduced to compound Q, also with empirical formula C2H5O. Which statement is correct?
AX is a cis isomer; compound P and compound Q are identical.
BX is a cis isomer; compound P and compound Q are isomers of each other.
CX is a trans isomer; compound P and compound Q are identical.
DX is a trans isomer; compound P and compound Q are isomers of each other.
✓ Correct Answer
The correct answer is A. This question tests the candidate's understanding of introduction to organic chemistry within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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