QUESTION 10 Which statement best explains the partial racemization seen in some

Question

QUESTION 10

Which statement best explains the partial racemization seen in some cases of SN1 reactions?

The C-X bond of the alkyl halide dissociates completely, and the dissociated and solvated carbocation does not become entirely planar but retains its configurational information in part.

The partial racemization must be the result of contributions by the SN2 reaction path.

The alkyl halide reacts as an intimate ion pair or a solvent-separated ion pair, and the carbocation never really becomes fully planar; therefore, it retains its stereochemical information content.

The alkyl halide reacts as an intimate ion pair or a solvent-separated ion pair, and one face of the planar carbocation is covered up by the leaving group

e.The SN1 reaction yields complete racemization, but afterwards, one of the enantiomers is interconverted into the other more stable enantiomer under the reaction conditions.

QUESTION 2

Which olefin is the building block of the polymer "PVC"?

chloroethene

1,1-dichloroethene

1,2-dichloroethene

1,1,2,2-tetrachloroethene

ethene

a.

The C-X bond of the alkyl halide dissociates completely, and the dissociated and solvated carbocation does not become entirely planar but retains its configurational information in part.

b.

The partial racemization must be the result of contributions by the SN2 reaction path.

c.

The alkyl halide reacts as an intimate ion pair or a solvent-separated ion pair, and the carbocation never really becomes fully planar; therefore, it retains its stereochemical information content.

d.

The alkyl halide reacts as an intimate ion pair or a solvent-separated ion pair, and one face of the planar carbocation is covered up by the leaving group

e.The SN1 reaction yields complete racemization, but afterwards, one of the enantiomers is interconverted into the other more stable enantiomer under the reaction conditions.

QUESTION 2

Which olefin is the building block of the polymer "PVC"?

a.

chloroethene

b.

1,1-dichloroethene

c.

1,2-dichloroethene

d.

1,1,2,2-tetrachloroethene

e.

ethene

Explanation / Answer

10. The statement which best describes partial racemization in an SN1 reaction would be,

c. The alkyl halide reacts as an intimate ion pair or a solvent-separated ion pair, and the carbocation never really becomes fully planar; therefore, it retains its stereochemical information content.

2. The building clock monomer for PVC polymer is,

a. chloroethene

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