Test: Spectroscopy Level - 1 - Chemistry MCQ

In the IR spectrum of p-nitrophenyl acetate, the carbonyl absorption band appears at:

A triatomic molecule of the type AB₂ shows two IR absorption lines and one IR-Raman line. The structure of the molecule is:

In the IR spectrum, the absorption band due to carbonyl group in phenyl acetate appears at:

In the IR spectrum of p-nitrophenyl, acetate, the carbonyl absorption band appears at:

A compound with molecule formula C₄H₆O₂ shows band at 1170 cm^–1 in IR spectrum and peaks at 178, 68, 28 and 22 ppm in ¹³C NMR spectrum. The correct structure of the compound is:

The compound that exhibits sharp bands at 3300 and 2150 cm^–1 in the IR spectrum is:

Correctly matched structure and carbonyl stretching frequency set is:

Among the following, the compound that displays an IR band at 2150 cm^–1 is:

The compound which shows IR frequencies at both 3314 and 2126 cm^–1 is:

For the molecule CBr₄, the number of peaks which comprise the cluster for the molecular ion will be which of the following?

The IR stretching frequencies (cm^–1) for the compound X are as follows: 3300-3500 (s, br); 3000 (m); 2225 (s); 1680(s). The correct assignment of the absorption bands is:

Among the compounds given in the option (a) to (d), the one that exhibits a sharp band at around 3300 cm^–1 in the IR spectrum is:

The correct order of IR stretching frequency of the C=C in the following olefins is:

Arrange the chacacteristic timescales of the following set of dynamical spectroscopic techniques in decreasing order of time (longest to shortest); NMR (Nuclear Magnetic Resonance), ESR (Electron Spin Resonance), Fluorescence, Raman and Absorption.

What are the limits of detection of the following common analytical methods used with capillary separations: fluorescence, mass spectrometry, UV-Vis absorbance, and NMR, respectively, in mol:

Of the molecules CH₄, CO₂, benzene and H₂, the ones that will absorb infrared radiation are:

IR stretching frequencies of carbonyl groups in aldehydes and acid chlorides in cm^–1 are:

The bond that gives the most intense band in the infrared spectrum for its stretching vibrations is:

An examinations of saturated hydrocarbons containing methyl group show asymmetrical (V_as) and symmetrical (V_s) stretching modes in the region of:

For each set of compounds below, choose the one in which the indicated hydrogen is farthest upfield in a proton NMR spectrum:

The molecule with the smallest rotational constant (in the microwave spectrum) among the following is:

N₂ does not show pure vibrational spectral because:

Which of the following molecules has the lowest vibrational stretching frequency:

A radiation that has an energy of N 50 kJ mol^–1 falls in the following region of the electromagnetic spectrum:

The rotational constant (B) of H³⁵Cl, H³⁷Cl and D³⁵Cl follow the order:

The spectroscopic data for an organic compound with molecular formula C₁₀H₁₂O₂ are given below. IR band around 1750 cm^–1. 1H NMR d 7.3 (m, 5H), 5.85 (q, 1H, J = 7.2 Hz), 2.05 (s, 3H), 1.5 (d, 3H, J = 7.2 Hz) ppm. The compound is:

The correct order of the ¹H NMR chemical shift values (β) for the indicated hydrogens (in bold) in the following compounds is: