2. (6 pts) For the corresponding to its approximate frequency in its IR spectrum
ID: 636299 • Letter: 2
Question
2. (6 pts) For the corresponding to its approximate frequency in its IR spectrum. You may u or not at all. structures, place the appropriate letter next to each CO group next to the IR value an absorption value more than once, 1-1740 cm FI1710 cm 1-1680 cm' C+A 3. (8 pts) Answer the following questions, using the structures, a ? once, or not at all. More than one structure may have an answer from a thru j, indicate NA. to i. You may need to use a structure more thano a question does b. C. d. e. h. h Which should not exhibit an x electronic transition above 200 h Which will have a near 50:50 ratio of the M' and M:2 peaks at 162 and 184 amu? B e Which would be a suitable solvent for taking the UV spectra of the others because its Amax $200 nm nm when irradiated with UV light? the e for its n- transition at-260nm isExplanation / Answer
2.
I.Frequency in IR spectrum 1740 cm-1.
it will be represent esters answer will be D and F .
II. Frequency in IR spectrum 1710 cm-1.
it will be represent ketones ,answer will be E ( There is no conjugation on E group so little high value comared to cojugated ketones).
III. Frequency in IR spectrum 1680 cm-1.
it will be represent ketones , answer will be A and C ( there is conjugation on A and C groups so little lower value comared to non cojugated ketones).
IV. Frequency in IR spectrum 1665 cm-1.
it will be represent amides answer will be B .
* Any conjugated compound will have a less IR frequncy compared with non cojugated compounds .Resonace will change double to partial double bond , so bond strength will decreses , therfore IR frequency decreases.
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