2020 2nd SCT Organic Chemistry Answer Key PDF

## 2020 2nd SCT organic chemistry 1. Which cannot form geometric isomers? - a. 2-pentene - b. 1,3 dibromo cyclohexane - c. 1,1-2trichloropropene - d. 2-methyl-3 heptene 2. What is FALSE about terpenes? - A. Their monomer is Composed of 5 carbon molecule - B. The basic unit...

## 2020 2nd SCT organic chemistry 1. Which cannot form geometric isomers? - a. 2-pentene - b. 1,3 dibromo cyclohexane - c. 1,1-2trichloropropene - d. 2-methyl-3 heptene 2. What is FALSE about terpenes? - A. Their monomer is Composed of 5 carbon molecule - B. The basic unit is isoprene - C. Carotenes have 2 beta ionone rings - D. **Vitamins A has a carbonyl carbon.** - E. Monoterpenes has backbone of 10 carbons 3. For the molecule of 3 bromo 1 butanol: The number of stereocenter(s) is _ and the number of possible optic Isomers is - A. 1,1 - B. 0,1 - C. **1,2** - D. 2,3 - E. 3,4 4. Which one of the following is a sulfone? **A** 5. What is the relationship between the molecules? - A. Constitutional isomers - B. diastereomers - C. enantiomers - D. meso compound - E. identical 6. Which of the following can go through keto enol tuterization? - A. Lactic acid - B. **Pyruvic acid** - C. Acetic acid - D. Oxalic acid - E Glycerol 7. What is the name of the molecule? - A. O-xylene - B. Styrene - C. **P-xylene** - D. Toluene - E. Aniline 8. Choose the product of ethanol and acetone in 1/1 molar ratio? **A** 9. Which of the following reactions proceeds through Addition Nucleophilic mechanism? - A. **Formation of hemiacetal** - B. Catalytic hydrogenation - C. Addition to double bond - D. Bromination of Benzene 10. What is the product of ethyl-methyl-amine with acyl chloride - A. A Schiff base - B. N-nitrosoamine - C. No reaction - D. Tertiary amine - E. **N-N-disubstituted amide** 11. Which of the following is an O, P director? - A. R-NO2 - B. R-SO3 - C. **R-CH3** - D. R-CHO - E. R-COOH 12. What is true about saturated molecules? - A. The parent name of alkane is determined by the number of carbon atoms in the molecule. - B. In cyclohexane, an axial methyl is more stable than an equatorial - C. **In cyclohexane, an equatorial methyl is more stable than an axial** - D. An aliphatic alkane has the following formula: [CNH2N] 13. Which statement is NOT correct for the molecule? - 14. It is a tertiary amine. - 15. Its systematic name is: N,N-dimethyl-3-pentanamine. - 16. Its nitrogen is SP^3 hybridized - **17. The nitrogen can act as a hydrogen donor** 18. Which line contains the CORRECT order of the following compounds according to rate of nitration? - A. Nitrobenzene benzene<toluene - B. Nitrobenzene< toluene< benzene - C. benzene<toluene<Nitrobenzene - D. toluene < Nitrobenzene < benzene - **E. benzene< Nitrobenzene < benzene** 19. Who has the lowest pKa? - A. Phenol - B. O-cresol - C. **P-nitrophenol** - D. cyclohexanol - E. hexanol 20. What is wrong about quinones? - A. They can be used as reducing agent - B. All of the carbons have conjugated electron pairs - **C. They are the product of oxidation of diphenols** - D. They have 2 keto groups 21. What is the molecule's name? - A. Iso decalin - B. **Trans decalin** - C. Naphtalene - D. Anthracene 22. The biogenic amine synthesized from tryptophan is: - A. Acetyl choline - B. putrescine - **C. Serotonin** - D. Epinephrine - E. Dopamine 23. Which of the following is the most acidic carboxylic acid? - A. Butyric acid - B. Succinic acid - **C. Oxaloacetic acid** - D. Maleic acid 24. What is the products of hydrolysis with NaOH of the following compound? - A. **Methanol and benzoic acid** - B. Phenyl carbaldehyde and methanol - C. Phenol and formic acid - D. Formic acid and benzoic acid 25. What is wrong about the following reaction? - **A. It takes place in 1 step** - B. The result organic product is an ether - C. It is a nucleophilic substitution - D. A carbocation is formed as an intermediate 26. Vitamin C molecule contains the following structure: - A. Thioester - B. Amide - C. Amine - D. Lactam - **E. Lactone** 27. What is the name of the polymer made by the monomer of the molecule on the right? - A. PVC - B. **Polyisoprene** - C. Polyisobutene - D. Polyethene - E. Polypropene 28. What is the name of the molecule? - A. Adenine - B. Guanine - **C. Cytosine** - D. Thymine - E. Uracil 29. What is the IUPAC name of the molecule? - A. 2-Butoxy-methane - B. **2-Methoxy-butane** - C. Methyl butyl ether - D. 2-Methoxy-isobutane 30. Which of the following is not aromatic? - A. Pyrrole - B. Pyrimidine - C. Pyridine - D. Purine - **E. Piperidine** 31. Which statement FALSE about acetaldehyde? - **A. cannot form H bonds with water.** - B. Has dipole dipole interactions. - C. It has sp2 hybridized carbon. - D. vinyl alcohol can spontaneously rearrange itself to acetaldehyde. 32. What is the product of 1-butene & H2O? - A. Butane - B. But 1-ene-1-ol - C. But 1-ene-2-ol - **D. 2-butanol** - E. 1-butanol 33. What is incorrect about the following matching? - A. Folic acid- pteridine - B. **Histamine- Indole** - C. Epinephrine-Tyrosine - D. Heme- Pyrrole - E. Vitamin K- Quinone 34. Which statement is false about the reaction? - A. The mechanism of the reaction is addition - B. The result of step B is alpha-beta unsaturated aldehyde - C. The product of step A is alpha hydroxy-butanal - D. OH is the catalyze of the reaction - **E. Product B is an enol** 35. What is FALSE about fatty acids? - A. Palmitic acid is a saturated acid - B. Oleic acid has a lower boiling point than stearic acid - **C. Triglycerides consist of glycerol bound in an amide bond to 3 fatty acids** - D. Fatty acids can go through beta oxidation - E. Alpha linoleic acid has a lower boiling point than Oleic acid 36. How many SP hybridized carbon there in: 3 methyl 4 vinyl 1,2 heptadiene-5 yn - **A. 2** - B. 3 - C. 1 - D. 0 - E. 4