Textbook Questiona. Which occurs at a larger wavenumber:1. a C=C stretch or a C=C stretch?2. a C-H stretch or a C-H bend?165views
Textbook QuestionWould you expect an acetylenic C―H to absorb at a higher or lower wavenumber than the C―H in ethene?273views
Textbook QuestionLOOKING AHEAD We explain in Chapter 23 that substituents can transmit electronic information through the benzene ring when appropriately positioned. Assessments 14.55–14.59 allow us to use IR spectroscopy to discover this concept and apply it to an example (Assessment 14.60) that we study there. (••) Would you expect the stretching band of the carbonyl to appear at a higher frequency for cyclohexanecarbaldehyde or benzaldehyde? Explain.270views
Textbook QuestionLOOKING AHEAD We explain in Chapter 23 that substituents can transmit electronic information through the benzene ring when appropriately positioned. Assessments 14.55–14.59 allow us to use IR spectroscopy to discover this concept and apply it to an example (Assessment 14.60) that we study there. (•••) Justify the carbonyl stretching frequencies for a series of methoxybenzaldehydes. Specifically, why are the 2- and 4-methoxy derivatives similar to each other but different from the 3-methoxy derivative?265views
Open QuestionBased on IR data given determine the structure of the unknown. Unknown compound A has molecular formula C4H11N. It shows a peak at 2900 cm-1 and peaks in the fingerprint region.143views3rank5comments
Open QuestionBased on IR data given determine the structure of the unknown. Unknown compound B has molecular formula C4H11N. It shows a single peak at approximately 3400 cm-1 as well as peaks at 2900 cm-1 and in the fingerprint region. Compound B also possesses a branched alkyl group.162views1rank4comments
Open QuestionBased on IR data given determine the structure of the unknown. Unknown compound C has molecular formula C6H10O3. It shows peaks at 2900, 1850 , 1740 cm-1 and in the fingerprint region.148views1rank8comments
Multiple ChoiceMatch the following functional group choices with the supplied infrared spectra data 351views1rank4comments
Multiple ChoiceMatch the following functional group choices with the supplied infrared spectra data 283views1rank2comments
Multiple ChoiceMatch the following functional group choices with the supplied infrared spectra data. 289views3comments
Multiple ChoiceMatch the following functional group choices with the supplied infrared spectra data. 287views5comments
Multiple Choice What are the characteristic bands in an IR spectrum corresponding to a carboxylic acid?151views