Midterm Exam-1-Answerkey (Organic Chemistry I only) PDF

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Ochem Alkane-Alkyne worksheet (Organic Chemistry I) from Charles R. Drew University of Medicine and Science and is from the summer semester....

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Charles Drew University of Medicine and Science Summer - 2021 BMS-210 (Organic Chemistry-1) Midterm Exam-1 Instructor: Dr. Shukla Student’s Name:…………………Date: June-04, 2021 Group-A: Each question carries 2 point (20 x2=40) ___1. How many total bonds are in the correct structure of C3H4? (a) 5 (b)3 (c)4 (d) 8 ___2. Which organic compound was first synthesized in the lab? (a) Urea (b) Acetone (c) Phosphate fertilizer (d) Sugar ___3. Hydrocarbons means compounds that contain (a) H, C, and O (b) H and C (c) C, H and N (d) C, H and halogens ___4. The general formula CnH2n+1 represents : (a) alkane (b) alkene (c) alkyl (d) alkyne ___5. Hybridization of C in CH3OH is: (a) sp2 (b) sp (c) sp3 (d) sp3d ___6. If 3 hydrogen atoms of alkyl is removed, the compound formed is a. alkene b. alkyne c. alkane d. alkaline ___7. How many hydrogen atoms are present in a cyclichexene compound? a.12

b. 6

c.10

d. 14

___8. A neutral molecule having the general formula AB3 has two unshared electrons on A. What is the hybridization of A? (a) sp

(b) sp2

(c) sp3

(e) sp3d2

(d) sp3d

___9. What hybridization is predicted for N in CH3NO? (a) sp

(b) sp2

(c) sp3

(d) sp3d

(e) sp3d2

___10. Choose the molecule that is incorrectly matched with the shape of molecule. (a) CF4– tetrahedral (b) BeBr2– linear (c) H2O– Bent (d) NH3– tetrahedral (e) PF3 – pyramidal ___11. Organic compound containing five 10, two 20 and one 30 carbons is called a (an) (a) normal (b) iso (c) neo (d) cyclic ___12. Organic compounds are compound of carbon because it can form a. single bonds

b. double bonds

c. triple bonds

d. multiple bonds

___13. Hydrocarbon which contains one or more carbon-carbon triple bond is a. alkane b. alkene c. alkyne d. aldehyde ___14. The number of sigma and pi bonds present in an CH3CN molecule are a. 3 σ 2∏ b. 3 σ 1∏ c. 5 σ 2∏ ___15. IUPAC name of (CHO)2 is (a) Dialdehyde (b) Ethandial

d. 4 σ 3∏ (c) Ethandiol

___16. What is the first member of alkyne? (a) Ethyne (b) Methyne (c) Carbon

(d) Diethanal

(d) Propyne

___17. How many Pi-bonds are in a molecule of 2-Formylethannitrile? (a) 1 (b) 2 (c)3 (d) 4 1

---18. IUPAC name of C(CH3)4 is (a) pentane (d) 2.2-Dimethylpropane

(b) Tetramethylmethane

(c) Methylbutane

----19. How many lone pair of electrons are there at the central atom of PCl3? (a) 1 (b) 0 (c) 2 (d) 3 -----20. What is the general formula of alcohol? (a) CnH2nOH CnH2n-2 OH

(b) CnH2n+1OH

(c) CnH2n+2 OH (d)

Group-B: 1. Write the IUPAC names of the following organic compounds (20 Points): (a)

(b) CH3 CH(C2H5)2

6-Ethyl-8-methyl-5-Propyl-2-nonene

3-Methylpentane

(a) CH3-CH(OH)-CH(CH3)-CO-CH3

4-Hydroxy-3-methyl-2-pentanone CH3

(e)

(d) CH3

H2C H 2C H 2C

3.4-Dimethyl-1-hexene-5-yne

H2 C

H2 C

C C H2

CH3

CH

OH C H2

CH3

6-Ethyl-3,6-dimethyl-1-nonanol

2. Count the number of 1o, 2o ,3o and 4o carbons in the given compounds (20 points)

1o = 2 , 2o = 2 3o = 0, 4o = 0

1o = 3 , 2o = 2 3o = 3, 4o = 0

1o = 5 , 2o = 8 3o = 3, 4o = 1

CH(C3H7)(C2H5)2 1o = 3 , 2o = 4

1o = 4 , 2o = 3

3o = 1,

3o = 1,

4o = 0

4o = 0

2

3. Write the structure of following organic compounds (15 points) 3-Chloro-5,7-dimethyl-5-ethylnonane 2-ethyl-3-methyl-1-butanol CH3 CH3 Cl CH2CH3 l l l l C-C-C-C-C-C-C-C-C C-C-C-C-OH OH l CH3 3,5-Dimethylcyclohexanol 4-Chloro-3-methyl-1-pentanyne C-C-C-C= C l l Cl CH3 1-Amino-4-bromo-3-methyl-2-butene

1-ethyl-3-methyl-2-propylcyclopentane

C - C = C- C-NH2 l l Br CH3

Extra Credit (10 points)

Count the number of primary, secondary, tertiary and quarternary carbons in the following compounds 1o = 4 , 2o = 4 7 3o = 2, 4o = 0

Write the IUPAC names: (COOH)2 1,2-Ethandioic acid

(CNCOCN) 2-Keto-1,3-propandinitrile

3...