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Chapter 22: Problem 90
How many different pentapeptides can be formed using five different amino acids?
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For each of the following, fill in the blank with the correct response. All of these fill-in-the-blank problems pertain to material covered in the sections on alkanes, alkenes and alkynes, aromatic hydrocarbons, and hydrocarbon derivatives. a. The first "organic" compound to be synthesized in the laboratory, rather than being isolated from nature, was ____ ,which was prepared from _______. b. An organic compound whose carbon-carbon bonds are all single bonds is said to be _________. c. The general orientation of the four pairs of electrons around the carbon atoms in alkanes is _______. d. Alkanes in which the carbon atoms form a single unbranched chain are said to be _______ alkanes. e. Structural isomerism occurs when two molecules have the same number of each type of atom but exhibit different arrangements of the _____ between those atoms. f. The systematic names of all saturated hydrocarbons have the ending _____ added to a root name that indicates the number of carbon atoms in the molecule. g.For a branched hydrocarbon, the root name for the hydrocarbon comes from the number of carbon atoms in the _______ continuous chain in the molecule. h.The positions of substituents along the hydrocarbon framework of a molecule are indicated by the _______ of the carbon atom to which the substituents are attached. i. The major use of alkanes has been in _______ reactions, as a source of heat and light. j. With very reactive agents, such as the halogen elements, alkanes undergo ________ reactions, whereby a new atom replaces one or more hydrogen atoms of the alkane. k. Alkenes and alkynes are characterized by their ability to undergo rapid, complete _______ reactions, by which other atoms attach themselves to the carbon atoms of the double or triple bond. l. Unsaturated fats may be converted to saturated fats by the process of __________. m. Benzene is the parent member of the group of hydrocarbons called ______ hydrocarbons. n.An atom or group of atoms that imparts new and characteristic properties to an organic molecule is called a ______ group. o.A _______ alcohol is one in which there is only one hydrocarbon group attached to the carbon atom holding the hydroxyl group. p.The simplest alcohol, methanol, is prepared industrially by the hydrogenation of ______. q. Ethanol is commonly prepared by ______ the of certain sugars by yeast. r. Both aldehydes and ketones contain ______ the but they differ in where this group occurs along the hvdrocarbon chain. s. Aldehydes and ketones can be prepared by of______ the corresponding alcohol. t. Organic acids, which contain the ________ group, are typically weak acids. u. The typically sweet-smelling compounds called ____ result from the condensation reaction of an organic acid with an ________.
Ethylene oxide, is an important industrial chemical. Although most ethers are unreactive, ethylene oxide is quite reactive. It resembles \(\mathrm{C}_{2} \mathrm{H}_{4}\) in its reactions in that addition reactions occur across the \(\mathrm{C}-\mathrm{O}\) bond in ethylene oxide. a. Why is ethylene oxide so reactive? (Hint: Consider the bond angles in ethylene oxide as compared with those predicted by the VSEPR model.) b. Ethylene oxide undergoes addition polymerization, forming a polymer used in many applications requiring a nonionic surfactant. Draw the structure of this polymer.
Explain why methyl alcohol is soluble in water in all proportions, while stearyl alcohol \(\left[\mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{16} \mathrm{OH}\right]\) is a waxy solid that is not soluble in water.
Is octanoic acid more soluble in \(1 M \mathrm{HCl}, 1 M \mathrm{NaOH}\), or pure water? Explain. Drugs such as morphine \(\left(\mathrm{C}_{17} \mathrm{H}_{19} \mathrm{NO}_{3}\right)\) are often
Draw a structural formula for each of the following compounds. a. 2 -methylpropane b. 2 -methylbutane c. 2 -methylpentane d. 2 -methylhexane
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