2.1. The figure that follows represents the structure of Limonene, which is a cycloalkene. CH2 CH3 CH3 2.1.1. How many atoms with sp? hybridization are there in this structure? 2.1.2. Which type or types of Van der Waals forces are present between molecules of limonene? Motivate your answer.
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- Linolenic acid (Table 10.2) and stearidonic acid are omega-3 fatty acids, unsaturated fatty acids that contain the first double bond located at C3, when numbering begins at the methyl end of the chain. Predict how the melting point of stearidonic acid compares with the melting points of linolenic and stearic acids. A current avenue of research is examining the use of soybean oil enriched in stearidonic acid as a healthier alternative to vegetable oils that contain fewer degrees of unsaturation.Give IUPAC for the following compound = Strategy: Remember the following rule; If the alkyl substituent has six or more than six carbons, the compound is named as phenyl-substituted alkane. If the alkyl substituent has less than six carbons, the hydrocarbon is named as an Alkyl-substituted benzenes. Then, select the longest carbon chain giving lowest possible numbers for its substituents. In this particular case, either side we get 2 and 5 numbers for the substutuents. Then how we select which way we should number? Now we need to think about the alphabet order, the substituents are methyl and phenyl, therefore methyl should have the lowest possible number as M comes first in the alphabet.How do you account for the difference in energies between the two staggered conformations of 1,2-dichloroethane? How about for the two eclipsed conformations? Draw all four conformations and, on your drawing, indicate sources of strain – torsional, steric (gauche), steric eclipsed.
- Why is the percentage of molecules with the substituent in an equatorial position greater for isopropylcyclohexane than for fluorocyclohexane?Why does the triple bonded carbon in C2H3N get counted three times towards the molar mass, but the triple bonded nitrogen only gets counted once? Why doesn't the nitrogen get counted three times as well?Explain briefly and clearly the following concepts, taking as reference the molecule of n-butane and the corresponding drawings or illustrations. See pages 149-152 of the book Organic Chemistry, sixth edition (J. G. Smith). 4. What is steric hindrance in a conformation? Then draw a picture to illustrate the concept? 5. What is the torsional stress of a conformation? Then draw a picture to illustrate the concept? 6. Describe 1,3-diaxial interaction and illustrate with a specific example.
- Rank these conformational isomers in order of decreasing potential energy. Rank from hightest to lowest potential energy. To rank items as equivalent, overlap them. Be sure to rank all of the structures!!!!Chiral compounds have a so-called asymmetric carbon atom in the molecular structure, and are opticalactive. Study the following organic molecule containing two −? − ? – groups (thiol) andwhich is a medicine against various types of metal poisoning, including against arsenic, mercury and lead: Image Based on this skeletal structure, judge whether this molecule is chiral. Give reasons for your answer.Suggest an IUPAC name for the molecule that takes into account all the given functional groups.FUNCTIONAL GROUPS The research team on Natural Products Chemistry from De La Salle University-Dasmariñas under Mr. Gab has discovered a novel compound from an endemic Philippine nudibranch, Chromodoris cavitensis, whichinhabits the coral reef system near Caylabne Bay in Ternate, Cavite. Exhaustive analysis has revealed acomplex structure as shown below which they aptly named as “chromocavitenin”. Initial tests revealed that thiscompound has potent anti-carcinogenic properties. Encircle and identify the 13 distinct functional groups that arepresent in chromocavitenin.
- 1 i. What is Resonance Theory? Sate five conclusions that can be drawn from the theory. ii. State the two main experiments that were used to establish the extra stability of the benzene molecule. iii. What are the factors that confer Aromaticity to an organic molecule? iv. State the effects of substituents on a benzene derivative towards further aromatic substitution. V. Based on the above suggest the various types of substituents that can be attached to Benzene.(a) Show the isoprene units in each of the following terpenes.(b) Classify each as a monoterpene, sesquiterpene, terpene,etc.Make a model of cyclobutane and draw its shape. Comment on its bond angles and how easily the model fitted together. Do you think cyclobutane is a stable or an unstable compound? Give reasons to support your answer including diagrams where appropriate.