4) Pick which one of the conjugated dienes would be preferred for 1,2-/1,4-additions as well as Diels-Alder cycloadditions. (a) (b) (c) (d) 5) Which one of the aromatic compounds is the least reactive one for the formation of ortho- and para-products as major? (a) NME2 (b) COME (c) OMe (d) NHCOME 6) Which one of the following ring systems is neither aromatic nor anti-aromatic? (a) + NH (b) | H. (c) (d) 7) The o-complex formed for the bromination of benzoic acid should be Br. .COOH .COOH Br- .COOH .COOH (a) (b) (c) (d) + H- H. Br Br 8) Which one of the bicyclotriene isomers shows the strongest UV absorption band (i.e. with longest wave length) due the most stable form? (a) (b) (c) (d)

4) Pick which one of the conjugated dienes would be preferred for 1,2-/1,4-additions as well as Diels-Alder cycloadditions. (a) (b) (c) (d) 5) Which one of the aromatic compounds is the least reactive one for the formation of ortho- and para-products as major? (a) NME2 (b) COME (c) OMe (d) NHCOME 6) Which one of the following ring systems is neither aromatic nor anti-aromatic? (a) + NH (b) | H. (c) (d) 7) The o-complex formed for the bromination of benzoic acid should be Br. .COOH .COOH Br- .COOH .COOH (a) (b) (c) (d) + H- H. Br Br 8) Which one of the bicyclotriene isomers shows the strongest UV absorption band (i.e. with longest wave length) due the most stable form? (a) (b) (c) (d)

Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter16: Chemistry Of Benzene: Electrophilic Aromatic Substitution

Section16.SE: Something Extra

Problem 25VC: The following molecular model of a dimethyl-substituted biphenyl represents the lowest-energy...

See similar textbooks

Similar questions

Propose a mechanism for the following cycloaddition reaction. Classify the reaction using the [m + n] classifications for cycloadditions. Draw the bonding molecular orbitals and identify the type of bonding present (supra - supra, antaraantara, or supra - antara). Identify if this reaction would proceed thermally or photochemically.
Give the structure(s) of the product(s) of each reaction. Indicate any relative stereochemistry, assuming that each of the Diels-Alder reactions will proceed with endo selectivity. If more than one product is formed, please indicate which one will be the major product or if they will be formed in equal amounts. If no reaction is expected to occur under the indicated conditions, then write "no reaction" or NR, and explain why you would expect nothing to occur. In all cases, equimolar amounts of both components/reagents are present unless indicated otherwise.
A conjugated diene with an even number of double bonds undergoes conrotatory ring closure underthermal conditions.
3c）Referring to the intermediates you drew in problem below explain in detail why no meta product is obtained in the Friedel-Crafts alkylation of chlorobenzene. Draw all pertinent resonance structures to support your argument.
Answer the following question pertaining to the reaction of maleic anhydride and 1,3-butadiene: - Which conformation of 1,3-butadiene, s-cis or s-trans, is thermodynamically preferred and why?
When 1,2-dimethylcyclopentene undergoes hydroboration–oxidation, one diastereomerof the product predominates. Show why this addition is stereospecific, and predict thestereochemistry of the major product.
With respect to the CIP rules, assign the groups high or low priority - also what is the overall stereochemistry of the double bond?
(a) A compound known to be a substituted cyclohexanone derivative has lamda max of 235 nm. Could this compound be a conjugated dienone? explain (b) (i)For this compound, how many nm must be accounted for by substituents? (ii) What are the substituents and the points of substitution that may occur having accounted for the 20nm?
The Diels–Alder reaction between butadiene and dimethyl maleate yields a ring structure, as shown in the product. Complete the structure by drawing any missing bonds and indicating the stereochemistry of the new stereocenters.
The spirocyclic pentadiene derivative F shown below is converted stereospecificallyinto compound G on heating. The transformation involves two consecutive pericyclicreactions of the same type, and proceeds via compound H which is not isolated. Identify the type of pericyclic reaction occurring, and determine the structure ofcompound H.
How would the molecular orbitals of cyclopenta-1,3-diene, the carbocation, carbanion, and the radical differ? Drawings would be appreciated! Thank you in advance.
Predict the product of the following Diels-Alder reaction. Make sure to indicate stereochemistry whereverapplicable.