GPAT PYQs – Set 52

Year: 2023

1024. Predict the theoretical maximum absorbance (λmax) for a compound using Woodward-Fieser rules with a base value of 215 nm.

Pharmaceutical Analysis • Spectroscopy

A. 240 nm B. 220 nm C. 225 nm D. 235 nm

1025. Anthranilic acid is a precursor for which amino acid?

Biochemistry • Amino Acid Metabolism

A. Tyrosine B. Tryptophan C. Ornithine D. Methidine

1026. What constitutes the tropane nucleus?

Pharmacognosy • Alkaloids

A. Pyrolidine & piperidine B. Pyrolidine & pyridine C. Pyrolidine & oscine D. Piperidine & oscine

1027. The stability index for oil–water emulsions indicates what?

Physical Pharmacy • Surface & Interfacial Tension

A. Defined by Δ/h at 35°C B. Relative enthalpy change C. Defined as 2Δ/h D. Relative conductivity change

1028. Epoxidation of Z-but-2-ene with peracids yields which product?

Organic Chemistry • General Organic Chemistry

A. Z-epoxide B. Meso epoxide C. E-epoxide D. None of these

1029. In halogenation of alkanes, which hydrogen abstraction is faster?

Organic Chemistry • General Organic Chemistry

A. Primary hydrogen B. Secondary hydrogen C. Both equal D. None of these

1030. Bromination of phenol in carbondisulphide at 0°C produces?

Organic Chemistry • General Organic Chemistry

A. 4-Bromophenol B. 2-Bromophenol C. 2,4-Dibromophenol D. 2,4,6-Triiodophenol

1031. Which compound is non-aromatic among the options?

Organic Chemistry • General Organic Chemistry

A. Option A B. Option B C. Option C D. Option D

1032. Which statement best describes E2 and SN2 reactions?

Organic Chemistry • General Organic Chemistry

A. Secondary: slow elimination, fast substitution B. Primary: slow elimination, fast substitution C. Tertiary: slow elimination, fast substitution D. Primary does not undergo elimination

1033. When 100 mL of 0.1 M NaOH is mixed with 100 mL of 0.1 M acetic acid, the pH is approximately?

Physical and Inorganic Chemistry • Acid–Base Equilibria

A. 83 B. 70 C. 38 D. 87

1034. Insertion of an oxygen into a carbonyl to form an ester is known as?

Organic Chemistry • Name Reactions

A. Baeyer Villiger oxidation B. Sharpless epoxidation C. Prevost oxidation D. Lossen rearrangement

1035. When 2-cholestene is treated with Br₂, the product is?

Organic Chemistry • General Organic Chemistry

A. 5β,6α-dibromocholestane B. 2β,3α-dibromocholestane C. 5α,6β-dibromocholestane D. 5α,6β-dibromo-3α-hydroxy cholestane

1036. Controlled alkylation via an enamine intermediate is known as?

Organic Chemistry • Name Reactions

A. Mannich reaction B. Robinson annulation C. Stork reaction D. Bamford Stevens reaction

1037. Identify the major product in the given Knorr synthesis reaction.

Organic Chemistry • Name Reactions

A. Option A B. Option B C. Option C D. Option D

1038. Heme is best described as which of the following?

Biochemistry • Heme & Cytochromes

A. Iron-containing tetrapyrrole B. Iron-containing polypeptide C. Copper/magnesium tetrapyrrole D. Iron-containing imidazole

1039. Bromination of isobutane under UV light yields which product?

Organic Chemistry • General Organic Chemistry

A. N-butyl bromide B. Isobutyl bromide C. sec-Butyl bromide D. ter-Butyl bromide

1040. What is the descending order of nucleophilic solvent strength?

Physical and Inorganic Chemistry • Solvent Properties

A. Trifluoroethyl alcohol, methanol, formic acid, acetic acid B. Formic acid, acetic acid, methanol, trifluoroethyl alcohol C. Methanol, formic acid, acetic acid, trifluoroethyl alcohol D. Methanol, acetic acid, formic acid, trifluoroethyl alcohol

1041. Ethylketazocine, a 6,7-benzomorphan derivative, shows selectivity for which receptor?

Pharmacology • Drugs Acting on Central Nervous System

A. Mu–opioid B. Delta–opioid C. Kappa–opioid D. NOP

1042. Which reagents are used to synthesize m-(n-Butyl) toluene from n-propyl m-tolyl ketone?

Organic Chemistry • Name Reactions

A. Zn(Hg), HCl B. NaBH₄, CH₃OH C. NH₂NH₂, NaOH D. SnCl₂, CH₃OH

1043. Which enzyme is used to synthesize optically active mandelic acid from benzaldehyde?

Biochemistry • Enzymatic Reactions

A. Invertin B. Myrosin C. Emulsin D. Zymase

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GPAT PYQs – Set 52

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