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- Which set of reagents would be appropriate to synthesize bromobenzene from benzene? O 1. HNO3 in H2SO4; 2. H2CrO4 and heat O 1. H2CrO4 and heat; 2. H2 Pd/C O Br2 and FeBr3 O 1. CH3CH2CHCI and AICI3; 2. H2CRO4 and heat O4B12 and Fe O Heat and Br2 OBR2, HCIi. LIAIH4 i. deprotection .CO2ME J CH2=CHCOCH3 protection ii. H30* ii. dehydration K H The synthesis of K from H involves a 3-steps reaction as shown above. ii. Suggest the reagents involve in the protection, deprotection and dehydration steps.What is the missing reagent in the reaction below? of of. cr CI Multiple Choice O LIAIH4. [2] H2O (1] CH2=CHLI, [2] H2O (1]) (CH2=CH)2CULİ, (2) H20 (1] DIBAL-H, (2] H20
- What series of reagents are necessary to carry out the following conversion? CH3 Br CH;ČCI / AICI, ;Br/FeBr3 Br2. FeBr3; H30*; CH;ČCI / AICI, O CH;CH2CH2CI; PCC, CH2CI2; Br2FeBr3 JAICI3; Br2/FeBr3 Br2/FeBr3; Fuming H2SO4; :H30* CH,ČCI / AICI334. Draw the major organic product(s) for the following reactions; (*) must include correct stereochemistry; double-dagger (+) must show two products. HBr (a)* Br HBr Br (b) + (1.00 equiv.) Br Br HBr (c)* HCI (d) 48% wt. HBr 37% wt. HCI HEAT OH [H2SO]/ H20 (g) OCH3 [H2SO,]/A CH,OH (excess) (h) [H,SO,1/H20 OH (i)* [H2SO,] / H,0 OH 13Which of the following provides a synthetic route to convert 3-iodo-2-methyl-1- butene into 2-methyl-2-butene? 1. NaOH; 2. H₂, Pt 1. H₂, Pt; 2. Br2 1. H₂, Pt; 2. NaOEt 1. H₂, Ni₂B; 2. KOtBu 1. H₂, Pt; 2. KOtBu
- In each reaction box, place the best reagent and conditions from the list provided. 1) Br 2) 3) DEET (the active ingredient in over the counter insect repellant) 4) 5) Answer Bank Mg. Et,0 CH,CH,OH НСООСH, H,CO НСООН NH(CH,CH,),(2 equiv.) Br,, FeBrz CH,COOH HN(CH,CH,), (1 equiv.) NaNH, H,0+ CH,CH,NH, CO, CH,CH, Br SOC, NaCN1. Give the major product(s) of the following reactions as needed. Include any stereoisomers. NaOEt 1. Br NaOH Br 2. NaOtBu 3. A MEOH 4. Br 2. Which reaction will proceed faster A or B? H,S H2S "CI .... вWhat is the expected major product for the following reaction? O IV I OCH 3 |||||... + enantiomer || 1. Hg(OAc)2, CH3OH 2. NaBH4 НО. OH ... H3CO. + enantiomer ||| IV H3CO V
- 37- The Sulphonation of benzene ring proceeds by using . ???? SO,H (A) Conc.HNO3 and conc. H2S04 (C) Conc. H2SO4 (B) Dil. H2SO4 (D) SO3/ H2SO4 38- Which of the following benzene derivative is the most reactive and ortho, para director? CHO NH. (A) (B) (C) (D) 39- What is the major product for the following reaction? NO, HNO, ???? H,SO, NO, NO, NO, NO (A) NO, (B) NO, (D) None of these 40- a – D - glucose differ from B-D-glucose (A) Because they are anomer (B) Because they are enantiomers (C) Because they are mirror image of each other (D) Because they are geometrical isomers 41-Ninhydrin test is given by (C) Proteins (D) Carbohydrates (B) Alcohols (A) Alkynes 42- Which test of the following can distinguish between 1°, 2° and 3° amines : (C) Acidic Test (D) None (B) Tolen's Test (A) The Hinsberg Test 43- How many a – amino acid are there in animal protein : (D) 10 (B) 20 (C) 15 (A) 55Reactions: Provide the structure(s) of the expected maior oreanic productis. Show stereochemistry where needed and write NR if there is no reaction. H2SO4, 1000C heat a. OH OH 1. TSCI, Pyridine 2. NaCN, DMSO b. HO, PCC, DCM с. (CH3);COK d. t-BUOH Cl 1. CH3MGBT, Et,O 2. H;0* C.36. What series of reagents could be used to carry out the conversion shown? Br- COH Br A) 1. excess Br2/FeBr3; 2. CH3CH2CI/AICI3; 3. fuming H2SO4; 4. dilute H2SO4, heat; 5. NaCr2O7/H2SO4/H2O B) 1. CH3CH2CI/AICI3; 2. fuming H2SO4; 3. excess Br2/FeBr3; 4. dilute H2SO4, heat; 5. NaCr2O7/H2SO4/H2O C) 1. excess Br2/FeBr3; 2. CH3CH2CH2CI/AICI3; 3. fuming H2SO4; 4. CH3CH2CI/AICI3; 5. fuming H2SO4; D) 1. excess Br2/FeCl3; 2. H3O+, heat; 3. (CH3)2CHCI/AICI3; 4. fuming H2SO4 E) 1. CH3CH2CI/AICI3; 2. fuming H2SO4; 3. excess Br2/FeBr3; 4. NaCr2O7/H2SO4/H2O