R or S? Exam Practice | Name It & Draw It with the Right-Hand Rule and Single Swap Rule

Practice assigning R and S the way exams ask: name a molecule from its structure, and draw a structure from its name. New to the right-hand rule or the single swap rule? Watch the full lesson first: [PASTE LINK: Stereochemistry: Right-Hand Rule and Single Swap Rule] What you will practice: Ranking groups by CIP priority, including ties broken one atom further out Finding the hidden hydrogen: it points the opposite way from the wedge or dash Right-hand rule: thumb toward priority group 4, curl from group 1. 1-2-3 is R, 1-3-2 is S Single swap rule: swapping any two groups flips R and S Writing R/S in a name: (R)-3-chloro-2-methylpentane, (1R,3S)-1-bromo-3-ethylcyclohexane Drawing from a name two ways: guess-and-check, or the faster trace method (clockwise puts group 4 on the dash) Problems: 1. Name it: (R)-3-chloro-2-methylpentane 2. Draw it: (1R,3S)-1-bromo-3-ethylcyclohexane 3. Your turn: (2R,3S)-2-bromo-3-methylpentane Chapters: 0:00 Introduction 0:16 Quick review: right-hand rule and single swap rule 0:59 Problem 1: Name the chain 1:32 Problem 1: Rank the groups 2:06 Problem 1: R or S? 3:08 Problem 2: Draw (1R,3S)-1-bromo-3-ethylcyclohexane 3:56 Problem 2: Check carbon 1 4:46 Problem 2: Check carbon 3 6:04 Problem 2: A faster way, no guessing 7:16 Your turn 7:31 Answer 8:37 The recipe Note: Some professors accept R or S without parentheses. Check with your professor before the exam. HalfStepSci: science, one half step at a time. Made for pre-med students, MCAT, and college organic chemistry courses. #OrganicChemistry #Stereochemistry #RandS #MCAT #Chirality