Which is the proper name for the structure shown? 1. Which of the following is 4

Question

Which is the proper name for the structure shown? 1. Which of the following is 4. NOT 2-bromo-5-nitrobenzoic acid? NO, A) 3-Methyl-5- B) 3-Methyl-l- c)) 3-Methyl-5- (1,4-dinitrobenzy1)-1-pentanal (2,5-dinitrophenyl)-5-pentanal (2, s-dinitropheny1) pentanal -dimitrophemyttpentanatdehyde (2,5- A) I B)II C)III )IV E)V E) 3-Methyl-5- 2. Which annulene would you NOT expect to be aromatic? A) [61-Annulene B) [14)-Annulene C) [16]-Annulene D) 1181-Annulene E) 122]-Annulene On the basis of molecular orbital theory and Hückel's rule, which molecules and/or ions should be aromatic? 5. 3. Application of the polygon-and-circle technique (Frost Circles) reveals that single electrons occupy each of the two nonbonding orbitals in the molecular orbital diagram of: O: Q in the electonbondibitareitagram of Vi1 A) I and V B) I11 and VI1I C) IV, VII and IX D) IV, VI, VII and Ix E) All of the structures, I-IX A) Cyclobutadiene B) Benzene c) cyclopropenyl cation D) Cyclopentadienyl anion E) Cycloheptatrienyl cation 6. Which one of the following compounds 7. Provide the reagents necessary to carry out the following conversion . will be most reactive towards bromination reaction? A) nitrobenzene B) anisole C) acetanilide D) benzene e A) propanone/ HS0 B) propanal/ H:S0 c) 1-propanol/H2SO D) 2-propanol/ H S0 E) Ethanal/ H2sO E) benzaldehyde Gr

Explanation / Answer

answers from 1 to

1) D (it is 2-bromo-6-nitrobenzoic acid

2) C (16- annuline is not aromatic since it does not follow Huckel rule i.e 4n+2. it follows only 4n rule

3)

4) 5-(2,5-dinitrophenyl)-3-methylpentanal

5) D ( all will follow huckel rule)

6) B (anisole, because of electron donating nature from OMe)

7) B

8) A (3-methyl hexane its a complete reduction of keto functionality)

9) C

10) A (1,2-dimethylcyclohex-1-ene)

11) D

12 A (I)

13 B ( it is simple aldehyde protection)

14) C

15) D (it is Witting olefination reaction with Ketone)

16) A (since aldehyde is electron meta-directing group it will allow nitro group to meta direction

17) E (for oxidation atleast one hydrogen is required at benzylic site)

18) C (in first keto compound will generate it will be act as meta directing group)

19) A

20) B (increasing alkyl groups around the keto functionality, electrophilicity will reduce)

21) A (I and II, which are having different configuration at C-2 carbon)

22) E

23) D

24) E

25) B

26) E

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