The total number of lines expected (due to spin-spin coupling of proton with fluorine and deuterium nuclei) in the $^1H$ NMR spectrum of the following compound is ________
To determine the number of lines expected in the 1H NMR spectrum of the compound, we need to consider the spin-spin coupling of the proton with the fluorine (F) and deuterium (D) nuclei.
Step-by-step Calculation:
- Spin of nuclei:
- Deuterium (D) has a nuclear spin quantum number of 1.
- Fluorine (F) has a nuclear spin quantum number of 1/2.
- Calculate coupling patterns:
- The coupling of H with D is given by (2nD + 1), where nD = 1 (spin of deuterium), resulting in 3 lines.
- The coupling of H with F is given by (2nF + 1), where nF = 1/2 (spin of fluorine), resulting in 2 lines.
- Combine couplings:
- Both nuclei will couple independently with H. The total number of lines will be the product of individual couplings: 3 (from D) × 2 (from F) = 6 lines.
Result: The total number of lines expected in the 1H NMR spectrum is 6.
Verification: The computed value of 6 is within the given range (5.99, 6.01).
Important Questions from NMR Spectroscopy (1H and 13C)
In the $^1H$-NMR spectrum of the following molecule, the signal of proton $H_a$ appears as
The $^1H$ NMR spectrum of the given iridium complex at room temperature gave a single signal at 2.6 ppm, and its $^{31}P$ 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
Compound K displayed a strong band at $1680 \text{ cm}^{-1}$ in its IR spectrum. Its $^1H$-NMR spectral data are as follows: $\delta$ (ppm) 7.30 (d, J = 7.2 Hz, 2H), 6.8 (d, J = 7.2 Hz, 2H), 3.8 (septet, J = 7.0 Hz, 1H), 2.2 (s, 3H), 1.9 (d, J = 7.0 Hz, 6H). The correct structure of compound K is
$^1H$ NMR spectrum of a mixture containing $CH_3Br$ ($x$ mol) and $(CH_3)_3CBr$ ($y$ mol) shows two singlets at 2.7 ppm and 1.8 ppm, with the relative ratio of 3:1 (integration value), respectively. The value of $x/y$ is ____________
(rounded off to the nearest integer)Consider the following $^1H$-NMR ($400$ MHz, DMSO-$d_6$) data of a compound:
$\delta$ in ppm: $3.85$ (s, $6H$), $6.73$ (t, $J = 2.2$ Hz, $1H$), $7.1$ (d, $J = 2.2$ Hz, $2H$), and $13.05$ (brs, $1H$).
The compound is
