Macroscale and Microscale Organic Experiments
7th Edition
ISBN: 9781305577190
Author: Kenneth L. Williamson, Katherine M. Masters
Publisher: Brooks Cole
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Chapter 3, Problem 9Q
You have an unknown with an observed melting point of
Is your unknown compound A with a reported melting point of
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4. A student has an unknown with an observed melting point of 82.5 °C -86 °C. Is it
Compound X with a reported melting point of 84.5 °C - 85 °C, Compound Y with a
reported melting point of 83. °C – 84 °C or Compound Z with a reported melting point of
88 °C – 89 °C. Explain your reasoning.
Rank the following compounds from HIGHEST to LOWEST melting point and explain
why they are in that order.
CH3F CaF2 CH3OH KF F2
Three samples labelled A,B, and C possess identical melting points: 99 degrees. When a 75/25 mixture of A and B is prepared, it’s melting point is 90-95 degrees. The melting point of a 50/50 mixture of A and C is 79-91 degrees. The melting point of a 25/75 mixture of B and C is 97-98 degrees. What information does this tell you about the identity of the 3 compounds? What would you expect an an approximate melting range for a 75/25 mixture of B and C?
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Macroscale and Microscale Organic Experiments
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- What type of compound is this? H CH, C-N-CH₂arrow_forwardGiven the information listed below, identify the compound. Physical description: This substance is a colorless but fragrant liquid that is oily in appearance. Chemical information: Observed Melting point: -78.5 °C Observed Boiling point: 138-142 °C Calculated MW: 130 g/mol Density: 0.876 g/cm3 Solubility in water: Minimally soluble, Other: Flash Point: 77 °F Spectroscopic information: IR bands indicate this compound contains C-H functionalities and the appearance of a strong stretch near 1700 cm-1 as well as several strong bands between 1500 and 1000 cm-1. The C-13 NMR spectrum for this compound indicates 6 unique carbon atoms and no cyclic structure. The proton NMR data indicate 5 sets of unique protons. C-13 NMR data of : PPM: 171.08, 63.13, 37.48, 25.18, 22.51, 20.96 Int: 222, 887, 645, 635, 1000, 473 Assign: 1, 2, 3, 4, 5, 6 H-1 NMR Assign: A, B, C, D, E Shift: 4.095, 2.037, 1.693, 1.521, 0.926arrow_forwardCircle the compound with the highest melting point. Indicate the compound with the lowest melting point.arrow_forward
- 5. Ftorotane is: A) Transparent colorless crystals with a characteristic odor B) Transparent colorless liquid with a pungent odor C) Transparent, colorless, heavy, highly volatile liquid; not flammable D) Colorless or pale yellow oily liquid; practically immiscible with water.arrow_forwardIdentify the compound below that shows geometric isomerism, draw the geometric isomers and which compound has the highest boiling point?arrow_forwardWhich of the following statements about molecules A-D is false? OH HO. HO Br HO HO.. OH HO Br Br Br Br Br Br Br A D. Molecule A and molecule B have the same boiling point A 50:50 mixture of molecules A and B is optically inactive OA solution of molecule D rotates plane-polarized light Molecule B and molecule C have different boiling pointsarrow_forward
- If a sample of benzoic acid (m.p. 121-122 degree C) was contaminated with a small amount of phenol (m.p. 40-42 degree C) , its melting point range would be observed : higher than 121-122 degree C and have a narrow range raised higher than 121-122 degree C and have a broad range lower than 121-122 degree C and have a narrow range lower than 121 -122 degree C and have a broad range O000arrow_forwardAn experiment was carried out to separate a mixture containing the following. Boiling Point Methyl Alcohol- 65 Ethyl Alcohol- 78 Toluene-114 Which component would be first to separate out?arrow_forwardN CH3 K₂Cr₂O7 H* Iarrow_forward
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