Which of the following statement is NOT true about IR absorption process? i. A molecule absorb only selected frequencies of infra-red radiation ii. All bonds in a molecule are capable of absorbing infrared energy. iii. Non-polar bonds are more likely to respond to IR radiation only i only i O only i O only i and i O only ii and i

Which of the following statement is NOT true about IR absorption process? i. A molecule absorb only selected frequencies of infra-red radiation ii. All bonds in a molecule are capable of absorbing infrared energy. iii. Non-polar bonds are more likely to respond to IR radiation only i only i O only i O only i and i O only ii and i

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter20: Molecular Spectroscopy And Photochemistry

Section: Chapter Questions

Problem 25P

See similar textbooks

Similar questions

9) The vibrational frequency of gaseous HCl occurs at 2885 cm¹ in the IR spectrum. What is the energy E, of this radiation in joules? a) 5.73 x 10-20 J b) 8.24 x 10-19 J c) 6.48 x 10-21 J d) 1.80 x 10-19 J
Which of the following statement is NOT true about IR absorption process? A molecule absorb only selected frequencies of infra-red radiation All bonds in a molecule are capable of absorbing infrared energy. Non-polar bonds are more likely to respond to IR radiation only i and iii only i only ii only ii and iii only iii
Beta-carotene is an organic compound with an orange color. The diagram above shows the ultraviolet spectrum of beta-carotene. Which of the following statements is true about the absorption bands in the spectrum?(see attached image) a.) The absorption band between 250250 and 320 nm320 ⁢⁢nm is due to transitions in electronic energy levels, and the absorption band between 380 and 520 nm is due to transitions in molecular vibrational levels. b.) The absorption band between 250 and 320 nm is due to transitions in molecular vibrational levels, and the absorption band between 380 and 520 nm is due to transitions in molecular rotational levels. c.) The two main absorption bands are associated with transitions in electronic energy levels. The band in the region corresponding to shorter wavelengths shows a lower absorbance than the band in the region corresponding to longer wavelengths. d.) The two main absorption bands are associated with transitions in molecular vibrational levels.…
If the spacings between adjacent vibrational features in a photoelectron spectroscopy experiment decrease, changing by a factor of 1/2, when you deuterate the molecule being ionized, is it more likely that the orbital from which you are ejecting an electron is from a nonbonding orbital, a p orbital localized on a C-C or C-O bond, or a s orbital localized on a C-H bond? Explain.
Why different molecular bonds have different IR spectroscopic peaks or bands?
Assume that the first line of the rotational spectrum (J = 0 → J = 1) of CO is 3.8424 cm-1. Calculate the length of the CO bond in picometer (10-12 m). To mark the answer, neglect the fractional part and do not write the unit. Information: mass of carbon: 12 c.u. mass of oxygen: 16 c.u. h = 6,6261 x 10-34 J.s π = 3,1416 c = 2,9979 x108 m.s-1 N = 6,0221 x 1023 mol-1
For the 'Li'H molecule the two snectrocconic conctants are known: 1405.6 cm 1 and B = 7.513 cm 1 4. Calculate the following quantities from these constants: a. Equilibrium Bond length b. The force constant of the vibration (in N/m) c. Energy (in wavenumbers) of the J= 2 to J = 3 transition
The “signature” infrared absorption that indicates the presence of a C-H stretching motion in a molecule occurs at wavelengths near 3.4 × 10-6m. Use this information to estimate the force constant of the C-H stretch.Take the reduced mass in this motion to be approximately equal to the mass of the hydrogen atom (a good approximation when the H atom is attached to a heavy atom).
8. Electronic Spectroscopy. Vibrational spectroscopy refers to changes in vibrational energy levels. Electronic spectroscopy refers to the photon energy absorbed or emitted by a molecule from electron transitions between different possible electronic states. On the diagram below, Draw arrows to illustrate the processes, and Label with the letters shown in bold. a) Franck-Condon principle for electronic excitation (F-C), from vibrational ground state v = 0. b) Collisional Relaxation in the excited states without photon emission (CR) c) Return to the ground state via Fluorescence (F) d) Intersystem Crossing (ISC) e) Return to the ground state via Phosphorescence (P) f) Infra Red absorbance of one quantum of vibrational energy from v = 0 in the ground state (IR) Raman scattering that allows transition from v = 0 to v = 1, in the ground state (RAMAN) On the x-axis, indicate the bond lengths re and ro for the ground electronic state only. Draw an arrow to show the magnitude of the Zero…
β-Carotene (1) is a linear polyene in which 10 sing le and 11 double bonds alternate along a chain of 22 carbon atoms. If the length of each CC bond is taken to be about 140 pm , then the length L of the molecular box in β-carotene is L = 2.94 nm. Estimate the wavelength of the light absorbed bythis molecule when it undergoes a t rans it ion from its ground state to the next higher excited state.
А. В. С. D. n=00 n=00 n=00 n-4 n=4 n=4 n-4 n=3 n-3 n=3 n-3 n-2 n-2 n-2 n-2Y n=1 n=1 n=1 n=1 Classify each of the hydrogen atom transitions above. Put letters in alphabetical order (no spaces or commas). If none are correct enter NONE 1. Absorption. 2. Emission 3. Ionization B.
Q.1: The force constant of the bond in HCl is (516 N/m). Assuming the value of the force constant does not depend on the mass of the atoms in the molecule, calculate the fundamental vibrational frequency of each of the following: 'HCl. 'H'Cl and ?H*Cl. Q.2: The Interatomic Distance in the HCl Molecule The spacing, A(1 /2) between the lines in the rotational spectrum of HCI(g) is 20cm'.Calculate the distance between the nuclei (the length of the bond) in the HCl molecule.