List of top Chemistry Questions on Spectroscopy asked in GATE CY

In IR spectroscopy, which bond absorbs at the highest wavenumber?

The total number of hyperfine lines expected in the EPR spectrum of \(\cdot\)CHsubscript{2OH (radical) is ___________ (in integer).}

The UV-visible spectrum of [Ni(en)\(_3\)]\(^{2+}\) (en = ethylenediamine) shows absorbance maxima at 11200 cm\(^{-1}\), 18350 cm\(^{-1}\), and 29000 cm\(^{-1}\).

[Given: Atomic number of Ni = 28] The correct match(es) between absorbance maximum and electronic transition is/are

Compound K displayed a strong band at 1680 cm⁻¹ in its IR spectrum. Its ¹H-NMR spectral data are as follows:

δ (ppm):
7.30 (d, J = 7.2 Hz, 2H)
6.80 (d, J = 7.2 Hz, 2H)
3.80 (septet, J = 7.0 Hz, 1H)
2.20 (s, 3H)
1.90 (d, J = 7.0 Hz, 6H)

The correct structure of compound K is:

The ¹H NMR spectrum of the given iridium complex at room temperature gave a single signal at 2.6 ppm, and its ³¹P NMR spectrum gave a single signal at 23.0 ppm. When the spectra were recorded at lower temperatures, both these signals split into a complex pattern. The intra-molecular dynamic processes shown by this molecule are:

The total number of hyperfine lines expected in the EPR spectrum of •CH₂OH (radical) is ___________ (in integer).

Compound(s) that show(s) an intense peak at \( m/z = 120 \) in the EI mass spectrum is/are:

The Vaska’s complex trans-IrCl(CO)(PPh₃)₂ shows a band at 1967 cm⁻¹ for the \( \nu_{\text{CO}} \) stretching vibration in its infrared spectrum. The complex(es) that will show an increase in the \( \nu_{\text{CO}} \) stretching vibration from 1967 cm⁻¹ is/are:

In the ¹H-NMR spectrum of the following molecule, the signal of proton H_a appears as: