FPGEE Pharmaceutical Chemistry Practice Questions — Questions and Answers

Question 1: The log P value of a drug compound represents:

The dissociation constant at physiological pH
The partition coefficient between octanol and water (Correct answer)
The rate constant for hydrolysis
The molar absorptivity in UV spectroscopy

Correct answer: The partition coefficient between octanol and water

Log P (partition coefficient) measures how a drug distributes between n-octanol (lipid) and water, indicating its lipophilicity.

Question 2: Glucuronidation is an example of which type of drug metabolism?

Phase I oxidation
Phase I reduction
Phase II conjugation (Correct answer)
Phase I hydrolysis

Correct answer: Phase II conjugation

Glucuronidation is a Phase II conjugation reaction catalyzed by UDP-glucuronosyltransferases, adding glucuronic acid to the drug.

Question 3: Which spectroscopic technique is most useful for determining the complete carbon-hydrogen framework of an organic drug molecule?

UV-Vis spectroscopy
Infrared spectroscopy
Nuclear magnetic resonance (NMR) spectroscopy (Correct answer)
Mass spectrometry

Correct answer: Nuclear magnetic resonance (NMR) spectroscopy

NMR spectroscopy provides detailed information about the carbon-hydrogen framework, connectivity, and stereochemistry of organic molecules.

Question 4: Warfarin exists as two enantiomers. The S-enantiomer is approximately 5 times more potent than the R-enantiomer. This difference is an example of:

Pharmacokinetic stereoselectivity only
Pharmacodynamic stereoselectivity (Correct answer)
Constitutional isomer activity differences
Tautomeric equilibrium effects

Correct answer: Pharmacodynamic stereoselectivity

When enantiomers differ in pharmacological potency at a receptor, this reflects pharmacodynamic stereoselectivity due to chiral receptor binding sites.

Question 5: Which of the following best describes a bioisostere?

A salt form of a parent drug
A group that replaces another with similar size and electronic properties but potentially different pharmacokinetics (Correct answer)
An inactive metabolite of a drug
A chelating agent used in formulation

Correct answer: A group that replaces another with similar size and electronic properties but potentially different pharmacokinetics

Bioisosteres are atoms or groups that can replace each other while maintaining similar biological activity through comparable size, shape, and electronic properties.

Question 6: The Maillard reaction in pharmaceutical formulations primarily involves:

Oxidation of unsaturated fatty acids
Reaction between reducing sugars and primary amines (Correct answer)
Hydrolysis of lactam rings
Photodegradation of aromatic rings

Correct answer: Reaction between reducing sugars and primary amines

The Maillard reaction occurs between reducing sugars (e.g., lactose) and amine-containing drugs, causing browning and potential loss of potency.

Question 7: Which functional group undergoes N-acetylation as a Phase II metabolic pathway?

Carboxylic acid
Primary aromatic amine (Correct answer)
Tertiary amine
Phenol

Correct answer: Primary aromatic amine

N-acetyltransferases conjugate an acetyl group to primary aromatic amines (and hydrazines/sulfonamides) as a Phase II detoxification pathway.

Question 8: Which functional group is responsible for the acidic properties of aspirin?

Ester group
Carboxylic acid group (Correct answer)
Hydroxyl group
Amide group

Correct answer: Carboxylic acid group

The carboxylic acid (-COOH) group in aspirin (acetylsalicylic acid) donates a proton, conferring its acidic properties.

Question 9: The term 'prodrug' refers to a compound that:

Is active as administered
Requires metabolic conversion to exert its effect (Correct answer)
Is excreted unchanged in urine
Binds irreversibly to its receptor

Correct answer: Requires metabolic conversion to exert its effect

A prodrug is pharmacologically inactive until metabolized in the body to its active form.

Question 10: Which bond type is hydrolyzed during the metabolism of ester prodrugs?

Amide bond
Ether bond
Ester bond (Correct answer)
Disulfide bond

Correct answer: Ester bond

Esterases in plasma and tissues cleave the ester bond, releasing the active drug from an ester prodrug.

Question 11: The Henderson-Hasselbalch equation is used primarily to predict:

Drug solubility in organic solvents
The degree of ionization of a drug at a given pH (Correct answer)
The melting point of a pharmaceutical compound
The rate of oxidative metabolism

Correct answer: The degree of ionization of a drug at a given pH

The Henderson-Hasselbalch equation relates pH, pKa, and the ratio of ionized to unionized drug forms.

Question 12: Which class of reaction is CYP3A4-mediated hydroxylation classified as?

Phase II conjugation
Phase I oxidation (Correct answer)
Phase I reduction
Phase II acetylation

Correct answer: Phase I oxidation

CYP3A4 is a cytochrome P450 enzyme that catalyzes Phase I oxidation reactions, including aromatic and aliphatic hydroxylation.

Question 13: Isomerism involving non-superimposable mirror images of a molecule is called:

Geometric isomerism
Constitutional isomerism
Enantiomerism (Correct answer)
Conformational isomerism

Correct answer: Enantiomerism

Enantiomers are non-superimposable mirror images of each other, differing in the spatial arrangement around a chiral center.

Question 14: Which property of a drug is most directly improved by salt formation?

Lipophilicity
Aqueous solubility (Correct answer)
Protein binding
Blood-brain barrier penetration

Correct answer: Aqueous solubility

Salt formation converts a poorly water-soluble drug into an ionized form that typically has significantly greater aqueous solubility.

Question 15: Which analytical technique provides definitive molecular weight determination for a pharmaceutical compound?

High-performance liquid chromatography (HPLC)
Mass spectrometry (Correct answer)
Infrared spectroscopy
Potentiometric titration

Correct answer: Mass spectrometry

Mass spectrometry measures the mass-to-charge ratio (m/z) of ions, providing precise molecular weight and fragmentation pattern information.

Question 16: The chelation of metal ions by tetracycline antibiotics is clinically significant because:

It increases drug bioavailability when taken with dairy
It reduces absorption when taken with calcium, magnesium, or iron-containing products (Correct answer)
It enhances renal elimination of the drug
It activates the drug's antibacterial mechanism

Correct answer: It reduces absorption when taken with calcium, magnesium, or iron-containing products

Tetracyclines form insoluble chelate complexes with divalent and trivalent metal ions (Ca2+, Mg2+, Fe3+), significantly reducing oral absorption.

Question 17: Polymorphism in pharmaceutical solids refers to:

Different salt forms of the same drug
The ability of a compound to exist in more than one crystalline form (Correct answer)
Isomers with the same molecular formula but different connectivity
The conversion of a drug from solid to amorphous state

Correct answer: The ability of a compound to exist in more than one crystalline form

Polymorphs are different crystalline arrangements of the same molecule, which can differ in melting point, solubility, dissolution rate, and bioavailability.

Question 18: Which reaction is responsible for the yellow discoloration seen when phenothiazine drugs degrade?

Hydrolysis of the phenothiazine ring
Oxidation of the sulfur atom forming sulfoxides (Correct answer)
Reduction of the aromatic system
N-dealkylation of the side chain

Correct answer: Oxidation of the sulfur atom forming sulfoxides

Phenothiazines are oxidized at the sulfur atom to form sulfoxide metabolites and degradation products, producing characteristic colored compounds.

Question 19: The Hammett sigma (σ) constant in quantitative structure-activity relationship (QSAR) studies describes:

Steric effects of substituents on a ring
Electronic effects (electron-donating or electron-withdrawing) of aromatic substituents (Correct answer)
Lipophilicity contribution of each substituent
The molar refractivity of a substituent

Correct answer: Electronic effects (electron-donating or electron-withdrawing) of aromatic substituents

The Hammett σ constant quantifies the electronic effect of a substituent on an aromatic ring, with positive values indicating electron withdrawal and negative values indicating electron donation.

Question 20: Which type of covalent bond formation between a drug and its target is associated with irreversible inhibition?

Hydrogen bond formation
Van der Waals interaction
Alkylation of a nucleophilic residue (Correct answer)
Ionic interaction with charged amino acids

Correct answer: Alkylation of a nucleophilic residue

Covalent alkylation of nucleophilic residues (e.g., cysteine, serine) by reactive drug electrophiles creates a permanent drug-protein bond, irreversibly inhibiting the target.

Question 21: In the context of drug stability, photolysis most commonly affects drugs containing:

Saturated aliphatic chains
Aromatic rings and conjugated double-bond systems (Correct answer)
Quaternary ammonium groups
Simple alkyl halides

Correct answer: Aromatic rings and conjugated double-bond systems

Drugs with aromatic rings and conjugated pi systems absorb UV/visible light, making them prone to photochemical degradation reactions.

FPGEE Pharmaceutical Chemistry Practice Questions

The log P value of a drug compound represents:

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