Thestereoisomer whichreacts faster in the elimination reaction on treatment with sodium ethoxide in ethanol is to be predicted. Concept Introduction: > Dehydrohalogenation reaction is the loss of hydrogen and a halogen from adjacent carbon atoms in an alkyl halide to form the most stable alkene by β eliminations. > E 2 elimination reactions are favored whenever an alkyl halide is treated with a strong base. > The difference in the reaction rates between the two stereoisomers results from different degrees of π bond development in the E 2 transition state. > The anti-coplanar arrangement imposes little strain in the E 2 transition state, and elimination occurs readily. An absence of anti-coplanar arrangement increases the strain in the E 2 transition state, and this slows the rate of elimination.

Question

2. Calculate the branching ratio of the reaction of the methyl peroxy radical with either HO, NO 298K) (note: rate constant can be found in the tropospheric chemistry ppt CH,O,+NO-HCHO+HO, + NO, CH₂O+HO, CH₂00H +0₂ when the concentration of hydroperoxyl radical is DH01-1.5 x 10 molecules and the nitrogen oxide maxing ratio of 10 ppb when the concentration of hydroperoxyl radicalis [H0] +1.5x10 molecules cm" and the nitrogen oxide mixing ratio of 30 p Under which condition do you expect more formaldehyde to be produced and why

Answer 1

Question

Chapter 7.16, Problem 26P

Interpretation Introduction

Interpretation:

Thestereoisomer whichreacts faster in the elimination reaction on treatment with sodium ethoxide in ethanol is to be predicted.

Concept Introduction:
>
Dehydrohalogenation reaction is the loss of hydrogen and a halogen from adjacent carbon atoms in an alkyl halide to form the most stable alkene by β eliminations.
>
E2 elimination reactions are favored whenever an alkyl halide is treated with a strong base.
>
The difference in the reaction rates between the two stereoisomers results from different degrees of π bond development in the E2 transition state.
>
The anti-coplanar arrangement imposes little strain in the E2 transition state, and elimination occurs readily. An absence of anti-coplanar arrangement increases the strain in the E2 transition state, and this slows the rate of elimination.

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