The formal charges on the nitrogen and oxygen in the following structures are, r

Question

The formal charges on the nitrogen and oxygen in the following structures are, respectively: H_2C - C N A. +1, -1 B. 0, -1 C. +1, 0 D. 0, 0 E. -1, -1 A certain compound was named by five students (A. B, C, D and E) in five different ways. Which student is right? A 1-ethyl-3, 4-dimethylcyclohexane B. 3-ethyl-1, 6-dimethylcyclohexane C. 1-ethyl-4, 5-dimethylcyclohexane D. 4-ethyl-1, 2-dimethylcyclohexane E. Cannot answer this question D. cannot answer this question unless the structure of the compound is provided. Consider the S_N2 reaction: A + B - C rightarrow A-B + C If the concentrations of both reactants are tripled, the rate of the reaction will A. remain the same B. increase three fold C. increase six fold D. increase nine fold E. increase twenty seven fold F. decrease three fold Which statement below is true concerning the conversion of cis-1, 4-dimethylcyclohexane to trans -1, 4-dimethylcyclohexans? A. The conversion takes place by chair conformation ring nipping. B. You cannot do the conversion without breaking covalent bonds. C. The takes place by rotating the C(1) - C(2) bond by 180 degree. D. The conversion takes place through the boat conformations. E. Both A and D are correct. The species on the left represents the transition state for the: A. reaction of 1-propanol with HBr. B. reaction of 1 with OH^-. C. addition of HOBr to propene. D. addition of HBr to propene with peroxides. E. free radical bromination of propane in water Which of the following sets of conditions most favors the E2 mechanism? A. When the alkyl halide is tertiary and the base is a weak base. B. When the alkyl halide is tertiary and the base is a strong base. C. When the alkyl halide is primary or secondary and the base is a weak base. D. When the alkyl halide is primary or secondary and the base is a strong base. The acid-catalyzed dehydration of the alcohol shown below gives a major product which results from a carbocation rearrangement. Identify this major product. What is the product of the following Diels-Alder reaction?

Explanation / Answer

1)

Formal charge = [# of valence electrons] – [electrons in lone pairs + 1/2 the number of bonding electrons]

for N:

Formal charge = [# of valence electrons] – [electrons in lone pairs + 1/2 the number of bonding electrons]

= 5 - (0 + (1/2)*8)

= 5 - (4)

= +1

for O:

Formal charge = [# of valence electrons] – [electrons in lone pairs + 1/2 the number of bonding electrons]

= 6 - (6 + (1/2)*2)

= 6 - (7)

= -1

Answer: A

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