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25. The reaction of 11-cis-retinal with the lysine residue of a specific protein forms the light- sensitive pigment in the cells of retina. The light-sensitive pigment is an (A) amide. […]

24. The total number of multiplet peaks in the 1H NMR spectrum of 1,3,5-tri-isopropylbenzene in CDCl3 is           . Total Number of Multiplet Peaks in the ¹H NMR Spectrum of […]

23. A 0.1% (w/v) solution of a protein absorbs 20% of the incident light. What fraction of light is transmitted if the concentration is increased to 0.4%? [Correct to two […]

22. The technique that involves impacting samples with electrons is . (A) NMR spectroscopy (B) ESI mass spectrometry (C) IR spectroscopy (D) UV-vis spectroscopy Technique That Involves Impacting Samples with […]

21.The IR stretching frequency of the carbonyl (C=O) group of a typical saturated ketone is 1715 cm⁻¹. The IR stretching frequencies for the carbonyl groups present in three different acetophenone […]

20.The number of peaks in the ¹H NMR spectrum of methoxymethane (CH₃OCH₃) is __________. Number of Peaks in the ¹H NMR Spectrum of Methoxymethane (CH₃OCH₃) Correct Answer Correct Answer: 1 […]

19. Which of the following technique(s) can be used to determine the three-dimensional structure of an organic compound? (A) Mass spectrometry (B) NMR spectroscopy (C) UV-visible spectroscopy (D) X-ray crystallography […]

18. Which color of light excites a natural GFP to emit green fluorescence? (A) Blue (B) Green (C) Infrared (D) Red Which Color of Light Excites Natural GFP to Emit […]

17. A protein solution of 1 μM has transmission of 40% at 280 nm, when measured in a 1 cm cuvette using a UV-Visible spectrophotometer. The transmission of the same […]

16. Among the five fragments given below, the number of fragment(s) accelerated to the analyzer tube in mass spectrometer with electron ionization is/are ______. Electron Ionization Mass Spectrometry: How Many […]