Ans:C (1,3-diketo carbonyl compounds exist primarily in enol form because of intramolecular hydrogen bonding).
7. Which of these compounds exists primarily in an enol form IV A) I B) lI...
explain 21. Which of the following represent the enol form of the following molecule? OH OH cox cox B)11, CI DIVE) None of the above III IV 4)1 A) I B) II C) III D) IV E) None of the above
Which of the following compounds is least acidic? a. I b. II c. III d. IV e. V HBr HCI NH3 ?? IV
Tvas - XC Question 17 Which of the following is the most stable enol form of 1,3-cyclohexanedione? HO I. ОН HO IV. HO OH II. V. HO HO ОН III. O1 11 111 IV V SAMSUNG
All of the compoung hown below have an enol tautomer. Which compound's enol exists in the highest percentage enol form? Q Zoom B С D E MULTIPLE CHOICE OH b с d Q Zoom
6. Some compounds can exist as the enol form at equilibrium in high percentage. Which compound of those shown below will exist with the highest percent in the enol form?: 0 8 OH B. C. D. 7. Select the product for the reaction indicated: Br Br Bra AcОН Br Br , Br & B.
6. Some compounds can exist as the enol form at equilibrium in high percentage. Which compound of those shown below will exist with the highest percent in the enol form?: OH D. B. 7. Select the product for the reaction indicated: Br Br Bra ACOH Br Br Br Å A B
6. Some compounds can exist as the enol form at equilibrium in high percentage. Which compound of those shown below will exist with the highest percent in the enol form?: 8 8 d 8 A. 7. Select the product for the reaction indicated: 0 Br Bry AcOH Br Br Br A. B D
Question 3 Which of the following is a keto-enol tautomeric pair? OH OH OH and and o and COM OH I II III он OH a and a and IV CA. 1 B. V C.II D. IV E. III Question 4 What would be the major product of the following reaction sequence? он PCC 1. LDA(-78C) 2. CHCHOI ? CH C1 HO వరలో I II MI o IV A. II B. I C. V D. III E. IV
Which of the following compounds would you expect to be antiaromatic? (i) cyclooctatetraene (ii) 1,3-cyclooctadiene (iii) cyclooctatetraenyl dianion (iv) 1-ethenylcyclooctatetraene (v) 1,3,5,7-octatetraene Select one: a. i only b. i, ii, iv and v only c. iii only d. i and iv only e. all the above From my working I found i, ii, iv, and v to be non aromatic and iii to be aromatic. Is non aromatic the same as antiaromatic?
Which of the following compounds have conjugated double bonds? I II III IV II and v II, IV, and v I and III I, III, and IV all of them