S3.2 Functional groups: Classification of organic compounds (HL)
15 revision questions with answers for S3.2 Functional groups: Classification of organic compounds (HL). Read them here, or play the set as a class game on the projector. Free to host, and students join with a code.
Isomers with the same structural formula but different spatial arrangement of atoms?
- StereoisomersRight answer
- Structural isomers
- Homologues
- Tautomers
What this set covers
Organic structure at HL: stereoisomerism, chiral carbons, enantiomers, racemic mixtures and the polarimeter, cis-trans isomers of but-2-ene, and splitting patterns in ¹H NMR using the n + 1 rule.
- Common mix-up
- Students often mix up cis-trans isomers and enantiomers: cis-trans isomerism comes from restricted rotation about C=C, while enantiomers come from a chiral carbon.
- Revision tip
- Draw butan-2-ol with its four different groups marked, then apply the n + 1 rule to predict the splitting for each proton environment in ethanal.
All 15 questions and answers
Isomers with the same structural formula but different spatial arrangement of atoms?
Answer: Stereoisomers
Carbon atom bonded to four different groups?
Answer: Chiral carbon
Non-superimposable mirror-image molecules?
Answer: Enantiomers
Equimolar mixture of two enantiomers?
Answer: Racemic mixture
Instrument that measures the angle by which an optically active sample rotates light?
Answer: Polarimeter
Two enantiomers rotate plane-polarised light by equal angles but…?
Answer: In opposite directions
Isomer of CH₃CH=CHCH₃ with both methyl groups on the same side?
Answer: cis-but-2-ene
Cis-trans isomerism in alkenes arises from restricted rotation about which bond?
Answer: C=C bond
Which of these alcohols is chiral?
Answer: Butan-2-ol
Number of chiral carbons in CH₃CHClCH₂CH₃?
Answer: 1
Rule predicting peaks in a ¹H NMR signal split by n neighbouring protons?
Answer: n + 1 rule
¹H NMR splitting of a proton with three H atoms on the adjacent carbon?
Answer: Quartet
¹H NMR splitting of the CH₃ signal in an ethyl group, CH₃CH₂–?
Answer: Triplet
¹H NMR splitting of the CH₃ signal in ethanal, CH₃CHO?
Answer: Doublet
¹H NMR splitting of a proton with no H atoms on adjacent carbons?
Answer: Singlet
Play it as a class game
Play this set opens it in splycr, where you can host it for your class straight away. Hosting needs no account: put the room code on the projector, and students join from a phone with the code and their first name. Each question plays as multiple choice, and the three wrong options were written for that question.