1000 Multiple-Choice Questions in Organic Chemistry

Organic Chemistry 1000 Multiple-Choice Questions in Organic Chemistry Multiple choice questions usually include a phrase or stem followed by three to five options/choices. Test strategies : • Read the directions carefully • Know if you are penalized for guessing • Answer easy questions first Answering options : • Improve your odds, think critically • Hide the options, read the stem, and try to answer Select the option that most closely matches your answer • Read the stem with each option Treat each option as a true-false question, and choose the “most true” Strategies to answer difficult questions : • Eliminate options you know to be incorrect • Question options that are totally unfamiliar to you • Question options that contain negative or absolute words • “All of the above” If you know two of the three options seem correct, “all of the above” is a strong possibility • Number answers : Toss out the high and low and consider the middle range numbers • “Look alike options” Probably one is correct; choose the best but eliminate choices that mean basically the same thing, and thus cancel each other out • Echo options : If two options are opposite each other , chances are one of them is correct • If two alternatives seem correct, compare them for differences, then refer to the stem to find your best answer Guessing : • Always guess when there is no penalty for guessing or you can eliminate options • Don’t guess if you are penalized for guessing and if you have no basis for your choice • Don’t change your answer unless you are sure of the correction When taking a test you are demonstrating your ability to understand your course material. Successful test taking avoids carelessness. Stay relaxed and confident. Remind yourself that you are well-prepared and going to do well. If you find yourself anxious, take several slow, deep breaths to relax. Don’t talk about the tests to other students just before it; anxiety is contagious. This unit includes 1000 multiple choice questions. The purpose is to assess the breadth of student’s knowledge and understanding of the basic concepts of organic chemistry. Remember that the multiple choice questions : 1. are not simply definitions. 2. require application of recalled information, not simple recall. 3. require fine distinctions between correct and nearly-correct statements. 4. emphasize conceptual understanding These questions have been especially designed to cover all the important concepts of organic chemistry. Solve them carefully. You will be glad that you did ! 1. Which of the following is not a characteristic of organic compounds? (a) They usually have low melting points. (b) They usually are only slightly soluble or insoluble in water. (c) If water soluble they seldom conduct an electric current. (d) Bonds which bind the atoms together are nearly always ionic. Answer. (d) 2. The element least likely to be found in an organic compound is (a) oxygen (b) sulfur (c) nitrogen (d) silicon Answer. (d) 3. One of the major sources of organic compounds is (a) Natural gas (b) Fermentation (c) Sea water (d) Atmosphere Answer. (a) 4. Catenation is a property of the carbon atom which describes its ability to (a) bond with other carbon atoms (b) form double and triple bonds (c) exist in plant and animal form (d) form bonds in its ground state Answer. (a) 5. In stable organic compounds, carbon will always form (a) 2 bonds (b) 4 bonds (c) 3 bonds (d) 5 bonds Answer. (b) 6. Carbon-carbon double bonds consist of : (a) one σ bond, one π bond (b) two σ bonds, one π bond (c) one σ bond, two π bonds (d) two σ bonds, two π bonds Answer. (a) 7. Acetylene has a total of : (a) one σ bond, two π bonds (b) two σ bonds, four π bonds (c) three σ bonds, two π bonds (d) one σ bond, four π bonds Answer. (c) 8. In propene there are (a) eight σ bonds and one π bond (b) seven σ bonds and two π bonds (c) six σ bonds and three π bonds (d) nine σ bonds Answer. (a) 9. In propyne there are (a) six σ bonds and two π bonds (b) seven σ bonds and one π bond (c) six σ bonds and one π bond (d) eight σ bonds Answer. (a) 10. 1-Buten-3-yne has (a) six σ and four π bonds (b) seven σ and three π bonds (c) eight σ and two π bonds (d) nine σ and one π bond Answer. (b) 11. Compound in which carbons use only sp3 hybrid orbitals for bond formation is (a) CH3CH2CH3 (b) CH3C≡CH (c) CH3CH=CH2 (d) CH2=CH—CH=CH2 Answer. (a) 12. Compound in which carbon uses sp3 hybrid orbitals for bond formation is (a) (b) (c) (d) (CH3)3COH Answer. (d) 13. When the carbon atom is sp2 hybridized in a compound, it is bonded to (a) 2 other atoms (b) 4 other atoms (c) 3 other atoms (d) 5 other atoms Answer. (c) 14. Compound in which carbons use only sp2 hybrid orbitals for bond formation is (a)