Exam 2 Part A. CIRCLE THE BEST ANSWER (3 pt ea) 1. When the reaction between met

Question

Exam 2 Part A. CIRCLE THE BEST ANSWER (3 pt ea) 1. When the reaction between methane and chlorine is photochemically initiated, which of the following compounds sannot be formed through a termination reaction? A) CH3C B) HCI c) CH3CH3 D) Cl2 2. Which of the following is correct Fischer projection of the compound on the left? Circle answer 3. Which of the following is the definition of a meso compound? a) A diastereoisomer with two chirality centers that has a plane of symmetry b) A molecule with two identical chirality centers c) A chiral compound with more than one chirality center d) A molecule with chirality centers which is not achiral 4. Which of the following correctly expresses the standard Gibbs free energy change of a reaction in terms of the changes in enthalpy and entropy? E) none of the above 5. Which one is most likely to undergo rearrangement in an SN1 reaction? A) 3-bromopentane C) 3-chloropentane B) 2-chloro-3,3-dimethylpentane D) bromocyclohexane E) 1-bromo-4-methylcyclohexane 6. What term describes the structural relationship between cis-1,2-dimethylcyclopentane and trans1,3 dimethylcyclopentane? A) not isomers B) constitutional isomers C) enantiomers D) diastereomers E) conformers 7. If (R)-glyceraldehyde has a specific rotation of +8.7", what is the specific rotation of (S)- glyceraldehyde? A) 0.0 B) -8.7 C)+8.7" D) cannot be determined from the information given 8. Solvolysis occurs when a) the solvent acts as the substrate. c) the solvent dissociates the substrate.d) the solvent traps the counter-ion b) the solvent acts as the nucleophile. 9. If a molecule is chiral, what does that mean? a) The molecule has a plane of symmetry. b) The c) The molecule's mirror image will be nonsuperimposable e molecule will be necessarily dextrorotatory d) None of the above. 10. Which solvent is not a best suitable for an Sw2 reaction? a) acetone b) acetonitrile c) hexane d) DMSO

Explanation / Answer

1. HCl because H is in proton form, it isn`t a radical. termination reactions occur for radicals collisions in this case!

2. Projecting involves drawing two-dimensional (flat) a molecule. In the Fischer projection molecule is drawn crosswise with substituents the substituents to the bottom plane in the vertical and groups come to us in the horizontal, the point intersection of the two lines represents the projected carbon.

OPTION A

3. OPTION D. Meso Compound have chirality center but are aquiral because that has a plane of simmetry

Option A: no. because un diasteroisomer in not a meso compound.

Option B: no. a meso compound can to have two chirality centers no identical.

Option C: no. compunds with more than one chirality center aren`t meso compound.

4. OPTION A. Equation developed for Willard Gibbs in 1870. It gives the equilibrium condition and spontaneity for a chemical reaction.

5. OPTION B. generally undergo rearrangement in a SN1 reaction, the secondary or tertiary halide alkyl with linear alkyl chains.

6. OPTION D. They are a class of such stereoisomers that are non-superimposable but they are not mirror image each other.

PLEASE UPLOAD QUESTIONS 7,8,9,10 AND OUR TEAM WILL ANSWER THAT!

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