Organic Chemistry Flashcards
7 cards from real PCAT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Organic Chemistry flashcards as text
Which of the following best describes the Diels-Alder reaction?
Answer: Concerted [4+2] cycloaddition between a diene and a dienophile
The Diels-Alder reaction is a pericyclic [4+2] cycloaddition occurring in a single concerted step between a conjugated diene and a dienophile.
What is the product of treating a ketone with NaBH4 followed by aqueous workup?
Answer: A secondary alcohol
NaBH4 reduces a ketone (R2C=O) by delivering hydride to the carbonyl carbon, yielding a secondary alcohol after protonation.
What does the term 'leaving group ability' depend on most directly?
Answer: Stability of the leaving group as an anion or neutral molecule
A good leaving group departs as a stable species (weak base/stable anion), so leaving group ability correlates with stability after departure.
Which functional group is produced by the reaction of a carboxylic acid with an amine?
Answer: Amide
A carboxylic acid reacts with an amine (with heat or activation) to form an amide (R-CO-NR2) plus water.
In NMR spectroscopy, chemically equivalent protons show how many signals?
Answer: One signal per equivalent set
Chemically equivalent protons are indistinguishable and appear as a single NMR signal regardless of how many protons are in that set.
Which of the following is an example of electrophilic aromatic substitution (EAS)?
Answer: Nitration of benzene with HNO3/H2SO4
Nitration of benzene is a classic EAS reaction where the nitronium ion (NO2+) acts as the electrophile and substitutes a ring hydrogen.
What is the IUPAC name of CH3CH2CHO?
Answer: Propanal
CH3CH2CHO is a three-carbon aldehyde; the IUPAC suffix for aldehydes is '-al,' so the name is propanal.