It has been suggested that a compound of formulaC12B24N24 might exist and have a structure similar to thatof C60 (buckminsterfullerene).(a) Explain the logic of this suggestion by comparing thenumber of valence electrons in C60 and C12B24N24.(b) Propose the most symmetric pattern of carbon, boron,and nitrogen atoms in C12B24N24 to occupy the 60 atomsites in the buckminsterfullerene structure. Where couldthe double bonds be placed in such a structure?

It has been suggested that a compound of formulaC12B24N24 might exist and have a structure similar to thatof C60 (buckminsterfullerene).(a) Explain the logic of this suggestion by comparing thenumber of valence electrons in C60 and C12B24N24.(b) Propose the most symmetric pattern of carbon, boron,and nitrogen atoms in C12B24N24 to occupy the 60 atomsites in the buckminsterfullerene structure. Where couldthe double bonds be placed in such a structure?

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter10: Molecular Structure And Bonding Theories

Section: Chapter Questions

Problem 10.127QE

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(d) A substance has the molecular formula C4H,N. Is there any likelihood that this material contains a triple bond? Provide reasons.
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Dichloroethylene (C2H2Cl2) has three forms (isomers), eachof which is a different substance. (a) Draw Lewis structures ofthe three isomers, all of which have a carbon–carbon doublebond. (b) Which of these isomers has a zero dipole moment?(c) How many isomeric forms can chloroethylene, C2H3Cl,have? Would they be expected to have dipole moments?
There is persuasive evidence for the brief existence of theunstable molecule OPCl.(a) Draw a Lewis diagram for this molecule in which theoctet rule is satisfied on all atoms and the formalcharges on all atoms are zero .(b) The compound OPCl reacts with oxygen to giveO2PCl. Draw a Lewis diagram of O2PCl for which allformal charges are equal to zero. Draw a Lewis diagram in which the octet rule is satisfied on all atoms.
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Some natural proteins are rich in disulfide bonds, and their mechanical properties (tensile strength, viscosity, hardness, etc.) are correlated with the degree of disulfide bonding. (a) Glutenin, a wheat protein rich in disulfide bonds, is responsible for the cohesive and elastic character of dough made from wheat flour. Similarly, the hard, tough nature oftortoise shell is due to the extensive disulfide bonding in its α-keratin. What is the molecular basis for the correlation between disulfide-bond content and mechanical properties of the protein?(b) Most globular proteins are denatured and lose their activity when briefly heated to 65 °C. However, globular proteins that contain multiple disulfide bonds often must be heated longer at higher temperatures to denature them. One such protein is bovine pancreatic trypsin inhibitor (BPTI), which has 58 amino acid residues in a single chain andcontains three disulfide bonds. On cooling a solution of denatured BPTI, the activity of the…
We have just arrived at a bonding description for the formaldehydemolecule. Which of the following statements about themolecule is or are true?(i) Two of the electrons in the molecule are used to make the pbond in the molecule.(ii) Six of the electrons in the molecule are used to make the sbonds in the molecule.(iii) The C¬O bond length in formaldehyde should be shorterthan that in methanol, H3COH.(a) Only one of the statements is true.(b) Statements (i) and (ii) are true.(c) Statements (i) and (iii) are true.(d) Statements (ii) and (iii) are true.(e) All three statements are true.
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