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- Which of the following statements islare true about fat soluble vitamins (A. D, E. & K)? (a) Fats are non-polar substance while Vitamin A, D. E and K are polar substances. (b) Both fats and Vitamins A. D. E, &K are non-polar substances. (c) These fat soluble vitamins if taken in excess can accumulate in the body fats. (d) Fats are needed by our body to dissolve these vitamins. a b and c a and d O b, c and d Which of the following statements is NOT true about intramolecular force? O It holds atoms together in a molecule. It is the chemical bond between atoms in a molecule. O It stabilizes the individual molecules O It is weaker than intermolecular force.During our lectures on polymeric materials, I used polyethylene as an example because of its very straightforward structure. (a.) Ethylene (C2H4) is a colorless flammable gas. Draw a diagram to show what a single molecule of this gas looks like. Show all bonds with the following symbol (—). Recall that the bonds are highly covalent in nature.Linoleic acid is an essential fatty acid found in many veg-etable oils, such as soy, peanut, and cottonseed. A key structural feature of the molecule is the c is orientation around its two dou-ble bonds, where R1and R2 represent two different groups thatform the rest of the molecule. (a) How many different compounds are possible, changing onlythe cis-trans arrangements around these two double bonds?(b) How many are possible for a similar compound with three double bonds?
- Draw a Lewis structure for each of the following molecules: (a) chlorodifluoromethane, CHClF2 (b) propanoic acid, C2 H5CO2H (basic structure pictured below) (c) acetonitrile, CH3CH (the framework is H3C-C-N) (d) allene, H3CCCH2Draw a Lewis structure for each of the following molecule: (a) chlorodifluoromethane, CHCIF2 (b) propanoic acid C2H5CO2H (basic structure pictured below) (c) acetonitrile, CH3CN ( the framework is H3C-C-N) (d) allene, H2CCCH2For each of the following covalent bonds: (a) use the symbols δ+ and δ- to indicate the direction of polarity (if any).(a) C-F; (b) N-Br; (c) B-C; (d) Si-H(b) Rank the following covalent bonds in order of increasing polarity. (i) C-H, O-H, N-H; (ii) C-N, C-O, B-O; (iii) C-P, C-S, C-N
- Which of the following interactions can be definitely described as electrostatic in nature? O Hard acid - hard base O Soft acid- soft base O Hard acid - soft base O Soft acid - hard abseGiven that the condensed structure for GABA is H2N(CH2)3CO2H Find (A) the expanded structure and (B) the Line StructureThe arrangement of atoms in several biologically important molecules is given here. Complete the Lewis structures of these molecules by adding multiple bonds and lone pairs. Do not add any more atoms. (a) the amino acid serine: 車 0-H H-C-H H Н—N—с—с—о—н H (b) нон H-N-C-N-H (c) pyruvic acid: ноо н—с—с—с—о—н H. (d) uracil: H (e) carbonic acid: H-0-C-0-H
- Show the delocalization of charges in the following structures. Draw the resonance forms and indicate the movement of electrons with curved arrows.Hint: First draw the Lewis structure for each the compound.(i) CH2=CH─O-(ii) CH2=CH─O+Doxorubicin, shown here, is an important chemotherapy drug used to treat avariety of cancers, including bladder cancer, breast cancer, and certain forms of leukemia. Doxorubicin works by binding to DNA in such a way that a portion of it penetrates the DNA double helix— a process called intercalation. During transcription— the process that forms RNA— portions of the DNA strands are temporarily separated for the base sequence to be read and then are reconnected. With bound doxorubicin, however, the double helix does not reform properly after the strands are separated, which disrupts replication— the process that forms an identical copy of DNA. Which portion of doxorubicin do you think intercalates into the DNA double helix, and why do you think it has little difficulty doing so?The carbon–carbon bond length in C2H2 is 1.20 Å, that inC2H4 is 1.34 Å, and that in C2H6 is 1.53 Å. Near which ofthese values would you predict the bond length of C2 tolie? Is the experimentally observed value, 1.31 Å, consistent with your prediction?