Organic Chemistry PYQs – Set 69
Subject : Organic Chemistry
1361. Addition of HBr to 1,3-butadiene at 40°C yields
Organic Chemistry • Name Reactions • GPAT 2023
1362. Phenol reacts with chloroform in the presence of aqueous sodium hydroxide to yield the chief product
Organic Chemistry • Name Reactions • GPAT 2023
1363. Replacement of the diazonium group by halogen in the presence of copper powder is known as
Organic Chemistry • Name Reactions • GPAT 2023
1364. ___ is an example of an aromatic nucleophilic substitution reaction.
Organic Chemistry • Name Reactions • GPAT 2023
1365. Replacement of the diazonium group by halogen in the presence of copper powder is called
Organic Chemistry • Name Reactions • GPAT 2023
1366. The composition of 'Lindlar catalyst' is:
Organic Chemistry • Name Reactions • GPAT 2023
1367. According to Oppenauer Oxidation reaction, oxidation of secondary alcohol to ketone by reagent (X) in acetone takes place, what is 'X':
Organic Chemistry • Name Reactions • GPAT 2023
1368. Chromatographic techniques such as gas chromatography and liquid chromatography are not appropriate for separation of amino acids because
Pharmaceutical Analysis • Chromatography • GPAT 2023
1369. One of the principles upon which an HPLC detector functions is
Pharmaceutical Analysis • Chromatography • GPAT 2023
1370. Which of the following techniques is not useful to detect polymorphs
Pharmaceutical Analysis • Chromatography • GPAT 2023
1371. Condensation product of Ethyl isopentyl ester of diethyl malonic acid with urea and sodium ethoxide yields
Pharmaceutical Analysis • Chromatography • GPAT 2023
1372. The difficulties of long elution time and poor resolution in complex mixtures can be overcome by modification of elution analysis, known as:-
Pharmaceutical Analysis • Chromatography • GPAT 2023
1373. The principle of liquidliquid extraction is based on
Pharmaceutical Analysis • Chromatography • GPAT 2023
1374. The principle of gasliquid chromatography is based on
Pharmaceutical Analysis • Chromatography • GPAT 2023
1375. Which technique does NOT determine protein structure?
Pharmaceutical Analysis • Chromatography • GPAT 2023
1376. Which modification in elution analysis can overcome long elution times and poor resolution in complex mixtures?
Pharmaceutical Analysis • Chromatography • GPAT 2023
1377. A chromatogram with a retention time of 5.4 minutes and a base width of 0.41 minutes indicates a plate number of
Pharmaceutical Analysis • Chromatography • GPAT 2023
1378. The mass spectrum of a compound with MW ~137 shows two equally intense peaks at m/z 136 and 138. This suggests that the compound is:
Pharmaceutical Analysis • Spectroscopy • GPAT 2023
1379. Which compound would be expected to show intense IR absorption at 3300 cm⁻¹?
Pharmaceutical Analysis • Spectroscopy • GPAT 2023
1380. Polymorphs in pharmaceutical solids are detected by which technique?
Pharmaceutical Analysis • Spectroscopy • GPAT 2023
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