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- up an example (not appearing in this ChemActivity) of a pair of molecules that are a)constitutional isomers, b) conformers. c) configurational stereoisomers.What is the value in kJ/mol, of the lowest energy trnasition above? a.) 545 b.) 444 c.) 320 d.) 266Anti-Markovnokov’s rule is followed in the presence of? a. Ni b. CCl4 c. H2O2
- Consider the following aromatic compounds a para-substituted compound?, the most reactive towards EAS? an ortho-substituted compound? does not react with RX, FeX3?Which group in the following pair is assigned the higher priority in R,Snomenclature −CH2NH2, −NHCH3Use the Hammond postulate to explain why (CH3)2C = CH2 reacts faster than CH3CH = CH2 in electrophilic addition of HX.
- Which of the following is most soluble in basic medium? a. cyclopropane b. 1,3-cyclobutadiene c. 1,3-cyclopentadiene d. benzeneCompound X is insoluble in cold KMnO4, Br2 in CCl4, and conc. H2SO4. Compound X is most likely: a. an alkane b. none of these c. an alkene d. an alcohol e. an alkyl halide Indicate which of the ff. statements regarding nucleophilicity is incorrect. F- is more nucleophilic, hence, more reactive towards methyl iodide than Cl-. Second row elements are more nucleophilic than first row elements of comparable basicity. The rate of SN2 reaction may be markedly affected by the nucleophilicity of the attacking atom. Nucleophilicity is the affinity of a nucleophile to an electrophilic carbon Which of the following alkynes can be deprotonated by NaNH2 in liquid NH3? 3-Methylhex-2-yne Pent-2-yne 3-Methylbutyne none of these Hex-3-yneWhat is the structure based on the HNMR?
- Explain briefly and clearly the following concepts, taking as reference the molecule of n-butane and the corresponding drawings or illustrations. See pages 149-152 of the book Organic Chemistry, sixth edition (J. G. Smith). 4. What is steric hindrance in a conformation? Then draw a picture to illustrate the concept? 5. What is the torsional stress of a conformation? Then draw a picture to illustrate the concept? 6. Describe 1,3-diaxial interaction and illustrate with a specific example.please provide the machanisms of 1a, 1e, 1fIn 1935, J. Bredt, a German chemist, proposed that a bicycloalkene could not have a double bond at a bridgehead carbon unless one of the rings contains at least eight carbons. This is known as Bredt’s rule. Explain why there cannot be a double bond at this position.
