Chapter 25: Problem 9
Are carbon monoxide or ammonia considered organic molecules? Why or why not?
Chapter 25: Problem 9
Are carbon monoxide or ammonia considered organic molecules? Why or why not?
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Get started for freeAn unknown substance is found to contain only carbon and hydrogen. It is a liquid that boils at \(49^{\circ} \mathrm{C}\) at 1 atm pressure. Upon analysis it is found to contain \(85.7 \%\) carbon and \(14.3 \%\) hydrogen by mass. At \(100^{\circ} \mathrm{C}\) and 735 torr, the vapor of this unknown has a density of \(2.21 \mathrm{~g} / \mathrm{L}\). When it is dissolved in hexane solution and bromine water is added, no reaction occurs. What is the identity of the unknown compound?
Why is geometric isomerism possible for alkenes, but not for alkanes and alkynes?
An unknown organic compound is found on elemental analysis to contain \(68.1 \%\) carbon, \(13.7 \%\) hydrogen, and \(18.2 \%\) oxygen by mass. It is slightly soluble in water. Upon careful oxidation it is converted into a compound that behaves chemically like a ketone and contains \(69.7 \%\) carbon, \(11.7 \%\) hydrogen, and \(18.6 \%\) oxygen by mass. Indicate two or more reasonable structures for the unknown.
(a) Describe the primary, secondary, and tertiary structures of proteins. (b) Quaternary structures of proteins arise if two or more smaller polypeptides or proteins associate with each other to make an overall much larger protein structure. The association is due to the same hydrogen bonding, electrostatic, and dispersion forces we have seen before. Hemoglobin, the protein used to transport oxygen molecules in our blood, is an example of a protein that has quaternary structure. Hemoglobin is a tetramer; it is made of four smaller polypeptides, two "alphas" and two "betas." (These names do not imply anything about the number of alpha helices or beta sheets in the individual polypeptides.) What kind of experiments would provide sound evidence that hemoglobin exists as a tetramer and not as one enormous polypeptide chain? You may need to look into the chemical literature to discover techniques that chemists and biochemists use to make these decisions.
Draw the condensed structural formulas for two different molecules with the formula \(\mathrm{C}_{3} \mathrm{H}_{4} \mathrm{O}\).
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