Unknown containing C,H,N,O with MW of 87. P A Nujol mull of a compound with a molecular weight of 87.

the electron ionization mass spectrum of a small neutral molecule shows a base peak at 27 and a smaller peak at 26 with a relative abundance of 20%. Deduce the structure of the unknown compound. Step 3: if the molecular ion is odd or even, this indicates the number of nitrogens. The mass spec data shows an ____ (odd or even) molecualr weight.

PQ-2. Which structure would show major fragments in its mass spectrum at 57 and 85 m/z? O O (A) H3C (C) H3C CH3 CH3 (B) H3C (D) H3C CH3 CH3 CH3

QUESTION 3 Predict the IR absorption bands (peaks) observed in the spectrum of 3-methylcyclohexanone. sp3 C-H stretching (-2850-2960 cm 1) sp2 C-H stretching (-3000-3100 cm-1) Alcohol O-H stretch (-3300 cm-1, broad) C-O double bond stretch (-1700 cm-1) Aromatic out of plane bend for monosubstitution (690-710 and 730-770 cm-1). Aromatic out of plane bend for para (1,4) disubstitution (810-840 cm-1). Aromatic out of plane bend for meta (1,3) disubstitution (690-750 and 750-810 cm 1). Aldehyde C-H stretch (2750 and 2850 cm-1). Carboxylic acid (carboxy group) O-H stretch (-2500-3000 cm-1, broad) N-H stretch (2 bands at -3400 cm-1) N-H bend (-1600 cm*1) Aromatic C-C double bond stretches (-1500 and 1600 cm-1). Aromatic overtones (1667-2000 cm-1) O O O O

asses ent_id%3D_1 %D1 Remaining Time: 38 minutes, 25 seconds. ¥ Question Completion Status: OII O IV O All the above QUESTION 31 If a mixture has an ee of 90%, what is the percentage of each enantiomer? O 65% : 35% O 55% 45% O 80% 20% O 95% 5% O 75% 25% QUESTION 32 Using the bond dissociation energies given, calculate AH° for the following reaction. (CH3)3CCI H,0 (CH3),COH HCI Click Save and Submit to save and submit. Click Save All Ansuuers to save allanswers. Type here to search conn 立

26.4 Final answer is enough.

Given the mass spectrum above, what is the most likely molecular formula for this molecule? OCH₂CIBr more data needed ●CH₂Cl₂ OCH₂Br₂

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For each compound, assign likely structures to the fragments at each m/z value, and explain how each fragment is formed.a. C6H5CH2CH2OH: peaks at m/z = 104, 91b. CH2 = C(CH3)CH2CH2OH: peaks at m/z = 71, 68, 41, 31

69. Which of the following bonds has the weakest absorption? A. C=C; B. O-H; C. C=O; D. sp ³C-H; E. A & D