Concept explainers
(a)
Interpretation: The stable carbonyl compound,
Concept introduction: Electron withdrawing groups pulls electron density towards itself, and thus destabilizes the benzene ring, whereas electron releasing groups push electron density away from it, that is towards benzene ring, and thus stabilizes the benzene ring more.
(b)
Interpretation: The compound that forms higher percentage of hydrate at equilibrium is to be identefied.
Concept introduction:
(c)
Interpretation: The compound that exhibits carbonyl absorption at higher wavenumber in its
Concept introduction: Electron releasing groups decreases the bond order of the
Want to see the full answer?
Check out a sample textbook solutionChapter 21 Solutions
ORGANIC CHEMISTRY
- What peaks are expected in the IR spectrum and NMR (C-NMR and P-NMR) spectrum of triphenyl triethyl and tributyl phosphine H3C. CH3 CH3 Iributyiphosphine oxide H3C. P. CH3 CH3 Tuiettviphosphine Triphenviphosphine oxidearrow_forwardjust Barrow_forwardHow many signals does the unsaturated ketone have in 'H NMR and 13C NMR spectra? A. five 'H signals and six 13C signals B. six 'H signals and six 1°C signals C. six 'H signals and seven 1C signals D. five 'H signals and seven 1³C signalsarrow_forward
- An unknown compound D exhibits a strong absorption in its IR spectrum at 1692 cm−1. The mass spectrum of D shows a molecular ion at m/z = 150 and a base peak at 121. The 1H NMR spectrum of D is shown below. What is the structure of D?arrow_forwardKetones undergo a reduction when treated with sodium borohydride, NaBH4. What is the structure of the compound produced by reaction of 2-butanone with NaBH4 if it has an IR absorption at 3400 cm-1 and M+=74 in the mass spectrum?arrow_forwardAnethole, C10H12O, a major constituent of the oil of anise, has the 1H NMR spectrum shown. On oxidation with Na2Cr2O7, anethole yields p-methoxybenzoic acid. What is the structure of anethole? Assign all peaks in the NMR spectrum, and account for the observed splitting patterns.arrow_forward
- Consider carbonyl compounds A - E drawn below. (d) From what you learned about the position of the carbonyl absorption in the IR Sections B.3C and B.4B, which compounds has a carbonyl absorption at lower frequency?arrow_forwardIdentify products A and B from the given 1H NMR data. Treatment of acetone [(CH3)2C=O] with dilute aqueous base forms B. Compound B exhibits four singlets in its 1H NMR spectrum at 1.3 (6 H), 2.2 (3 H), 2.5 (2 H), and 3.8 (1H) ppm. What is the structure of B?arrow_forwardShow the effect of conjugation on the carbonyl absorption in an IR spectrum ?arrow_forward
- Explain why a carbonyl absorption shifts to lower frequency in an α,β-unsaturated carbonyl compound—a compound having a carbonyl group bonded directly to a carbon–carbon double bond. For example, the carbonyl absorption occurs at 1720 cm−1 for cyclohexanone, and at 1685 cm−1 for cyclohex-2-enone.arrow_forward7. Which has the higher boiling point, 1-butanol or 1-butanamine? 8. Circle the stronger base in the pair below, and briefly explain your choice. or (CH3CH2)2NH 9. How might one distinguish a sample of trimethylamine from a sample of n-propylamine using IR spectroscopy? ¹H NMR spectroscopy? ¹³C NMR spectroscopy?arrow_forwardIdentify products A and B from the given 1H NMR data. Treatment of CH2=CHCOCH3 with one equivalent of HCl forms compound A. A exhibits the following absorptions in its 1H NMR spectrum: 2.2 (singlet, 3H), 3.05 (triplet, 2 H), and 3.6 (triplet, 2 H) ppm. What is the structure of A?arrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning