Organic Mid Term Babylon University PDF

Q1 / Choose the correct answer(s) for the following question: 1- Which compound is least basic? a) b) c) d) https://t.me/Micro_23BUCOP 2- Which is most reactive in electrophilic aromatic substitution? a) b) c)...

Q1 / Choose the correct answer(s) for the following question: 1- Which compound is least basic? a) b) c) d) https://t.me/Micro_23BUCOP 2- Which is most reactive in electrophilic aromatic substitution? a) b) c) d) 3- Which of (a) to (d) is not aromatic? a) b) c) d) 4- Which is most stabilized by electron delocalization (resonance)? a) b) c) d) 5- Which of the following is not true about the five membered rings? a) Five membered rings are more stable than 4 membered rings b) Five membered rings are more stable than 6 membered rings c) Five membered rings are more stable than 7 membered rings d) Five membered rings are more stable than 8 membered rings 6- Which of the following five membered rings is most resonance stabilized? a) Furan b) Thiophene c) Pyrrole d) Pyridine 7- Five membered rings come under which category of heterocycle classification on the basis of chemical behavior? a) excessive heterocycle b) deficient heterocycle c) equivalent heterocycle d) Can’t say about the five membered rings | P a g e 1-9 8- What is the reactivity order in the following five membered heterocyclic compounds? a) Pyrrole b) Furan c) Thiophene d) Pyridine 9- Five membered rings come under which category of heterocyclic classification on the basis of chemical behavior? a) excessive heterocyclic b) deficient heterocyclic c) equivalent heterocyclic d) can't say about the five membered rings 10- Which compound is most basic? a) b) c) d) 11- Which of the following solvents is a heterocyclic compound? a) DMSO b) DMF c) THF d) none of the above 12- Electrophilic substitution in furan usually occurs at: a) Both the C2 and C3 atom b) The O atom c) The C2 atom d) The C3 atom 13- Which statement about thiophene is incorrect? a) The S atom contributes two electrons to the n- system b) Thiophene is polar c) Thiophene is less reactive than pyrrole d) Thiophene is more reactive than furan 14- Which drugs possess pyrrole heterocyclic compound from the following? a) Penicilline b) Miconazole c) Ciprofloxacin d) none of the above https://t.me/Micro_23BUCOP 15- Aziridine is a 3 membered ring has: a) one N atom b) two N atom c) N and O atoms d) Two O atoms | P a g e 2-9 16- Heterocyclic compounds with one heteroatom? a) pyran b) oxathiete c) purine d) oxaiziridine 17) Morpholine is ? a) tetrahydrooxazine b) 1,2,3-triazine c) 1,3,5-Triazine d) 3-Methylazine 18- Which of the following have S and N atoms? a) Thiazole b) Thiolan c) Oxiran d) Oxiren 19- Cinnoline is fused benzene ring with : a) five membered ring b) four membered ring c) six membered ring d) three membered ring 20- Which of the following drugs have imidazole ring? a) Nicotine b) Cimetidine c) Penicillin d) Niacin 21- Which of the following compounds more basic? a) 1,2 azole b) 1,3 azole c) Piperazine d) Purine 22- Saturated 3, 4 & 5-membered nitrogen heterocycles should use respectively the traditional ---------- suffix? a) iridine, etidine, olidine b) olidine, etidine, iridine c) etidine, iridine, olidine d) irane, etane, olane 23- Which of the following compounds saturated? a) 1,4-dioxane b) pyrollidine c) Piperazine d) All of the above | P a g e 3-9 24- What is the correct order of reactivity (most reactive first) of pyrrole, furan and thiophene towards electrophiles ? a) pyrrole > furan > thiophene b) thiophene > pyrrole > furan https://t.me/Micro_23BUCOP c) furan > thiophene > pyrrole d) furan > pyrrole > thiophene 25- Which of the following is a not a five membered ring? a) Pyridine b) Piperazine c) morpholine d) All of a above 26- Pyridine doesn't undergo the………………….electrophilic substitution a) Halogenation b) Friedel–Crafts reaction c) Nitration d) Sulfonation 27- The IUPAC name of the structure below is https://t.me/Micro_23BUCOP a) 2,3-dihydro-1,2-diazete b) 1,2-dihydro-1,2-diazete c) 3,4-dihydro-1,2-diazete d) 1H-1,2-diazete 28- The common name of the structure below is a) Pyridine b) Pyrimidine c) Pyrazine d) Pyradiazine 29- The IUPAC name of 1-methyl-1-H-indazole is a) 2-methyl-1H-benzo [b] pyrazole b) 1-methyl-1H-benzo [c] pyrazole c) 1-methyl-1H-benzo [b] pyrazole d) 2-methyl-2H-benzo [c] pyrazole | P a g e 4-9 30- 1,4-position with six members heterocyclic containing two nitrogen atoms is called a) Pyrimidine b) Pyridine c) Pyrazine d) Pyridazine 31- The IUPAC name of the structure below is a) 4-(1,2-oxathiet-3-yl)-2,5-dihydropyridine b) 3-(1,2-oxathiet-3-yl)-2,5-dihydropyridine c) 6-(1,2-oxathiet-3-yl)-2,5-dihydropyridine d) 5-(1,2-oxathiet-3-yl)-2,5-dihydropyridine 32- The IUPAC name of the structure below is a) pyrrolo[3,2-d][1,3]oxazine b) pyrrolo[4,5-d][1,3]oxazine c) pyrrolo[5,4-e][1,3]oxazine d) pyrrolo[3,2-e][1,3]oxazine 33- The IUPAC name of the structure below is a) 2H-1,3,6-oxadiazine b) 6H-1,2,5-oxadiazine c) 3H-1,3,6-oxadiazine d) 3H-1,2,4-oxadiazine `34- Imidazole is ……… than pyridine a) Less basic b) The same basicity c) More basic d) Not all of above | P a g e 5-9 35-What is the name of the following reaction? a) Chichibabin reaction b) Dealkylation of pyridine c) Hantzsch pyridine synthesis d) Bonnemann cyclisation 36- The following structure of pyridine derivatives is a) Picoline amide b) Picoline c) Pyridine-2-carboxylic acids d) All of above 37- 1,2-position with six members heterocyclic containing two nitrogen atoms is called? a) Pyridine b) Pyrimidine c) Pyrazine d) Pyridazine https://t.me/Micro_23BUCOP 38- The electron of Nitrogen participating in the resonance in pyridine is present in which orbital? a) p-orbital b) sp2-orbital c) sp3-orbital d) sp-orbital 39- Which of the following derivative of pyridine is mostly found in mammals? a) Nicotinamide b) Vitamin B6 c) Nicotinic acid d) Strychnine 40- The IUPAC name of the structure below is a) 2H-1,4,5-Oxadiazine b) 2H-1,3,4-Oxadiazine c) 6H-1,3,4-Oxadiazine d) 6H-1,4,5-Oxadiazine | P a g e 6-9 41- The IUPAC name of the structure below is a) 2H-oxete b) 4H-oxete c) 3H-oxete d) 4H-oxetane 42- The IUPAC name of the structure below is a) 2H-1,3,5-oxathiazine b) 6H-1,3,5-oxathiazine c) 4H-1,3,5-oxathiazine d) 6H-1,3,5-thioxazine 43- Pyridine is …………...than pyrrole a) Less basic b) The same basicity c) More Basic d) Not all of above 44- The name of the structure below is a) Cinnoline b) Quinoline c) Quinazoline d) Isoquinoline 45- The name of the structure below is a) pyrimido[2,1-c][1,4]thiazine b) pyrimido[1,2-c][1,4]thiazine c) pyrimido[1,6-c][1,4]thiazine d) pyrimido[6,1-c][1,4]thiazine | P a g e 7-9 46- The name of the structure below is a) 4-methylthieno[2,3-b]furan https://t.me/Micro_23BUCOP b) 3-methylthieno[2,3-b]furan c) 3-methylthieno[3,2-b]furan d) 4-methylthieno[3,2-b]furan 47- Niacin (Vitamine B3) is collective name of a) Nicontinic acid b) Nicontine Amide c) Nicontinic acid and Nicontine Amide d) Pyridoxal phosphate 48- The formation of Pipyridine from pyridine by reducing agent(s) a) H2, Pd/C b) Na / MeOH c) Zn / HCl d) All of above 49- The IUPAC name of the of the a) 1H-benzo[g]indole b) 1H-benzo[d]indole c) 1H-benzo[e]indole d) 1H-benzo[f]indole 50- Which of the following is an example of cyclic ether? a) Oxiran b) Epoxide c) Cyclobutane d) A and B | P a g e 8-9  35) A Answers : 36) B 37) D 1) B 38) B 2) C 39) B 3) C 40) C 4) C 41) A 5) B 42) B 6) B 43) C 7) A 44) C 8) A 45) D 9) A 46) B 10) C 47) C 11) C 48) D 12) C 49) D 13) D 50) D 14) D 15) A 16) A 17) A 18) A 19) C 20) B 21) C 22) A 23) D 24) A 25) D 26) B 27) B 28) B 29) B 30) C 31) D 32) A 33) B 34) C | P a g e 9-9