27. An alternative step in the free radical chlorination mechanism, of methane might be as follows: What is the reason that this step is not observed? Consider the "propagation step-2" of th radical mechanism. Cl• + CH4 → CH3CI + H• 1. Cl• cannot approach the carbon atom close enough to form a bond because of steric interference from hydrogens 2. H• is not among the products of methane chlorination 3. Cl• can only bond to hydrogen atoms 4. this step is too endothermic as compared to alternatives 5. this step is too exothermic

27. An alternative step in the free radical chlorination mechanism, of methane might be as follows: What is the reason that this step is not observed? Consider the "propagation step-2" of th radical mechanism. Cl• + CH4 → CH3CI + H• 1. Cl• cannot approach the carbon atom close enough to form a bond because of steric interference from hydrogens 2. H• is not among the products of methane chlorination 3. Cl• can only bond to hydrogen atoms 4. this step is too endothermic as compared to alternatives 5. this step is too exothermic

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter8: Haloalkanes, Halogenation, And Radical Reactions

Section: Chapter Questions

Problem 8.21P

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4. Why are most radical reactions considered "propagation" steps?
The following is a nucleophilic substitution reaction of R-3-bromohexane with "SH. The experimental rate law for this reaction is Rate = k [R-3-bromohexane] [SH] H. H.C C. CH3 SH H2 Br H. The mechanism for this reaction is SN2 Draw the organic molecule(s) which is(are) formed in this reaction. Do not include molecules like H,O or HCl. Draw the specific configuration (R or S) at any chiral carbons within your product(s). If both configurations are formed in the product(s), draw both as separate molecules/products.
Oo.47. Subject:- Chemistry
The following is a nucleophilic substitution reaction of S-3-chloro-2-methylhexane with "CN. The experimental rate law for this reaction is Rate k [S-3-chloro-2-methylhexane] CH3 H;C. C. C H. CH3 CEN H2 H. The mechanism for this reaction is SN1 Draw the orgamic molecule(s) which is(are) formed in this reaction. Do not include molecules like H,O or HCl. Draw the specific configuration (R or S) at any chiral carbons within your product(s). If both configurations are formed in the product(s), draw both as separate molecules/products.
CF2Cl2 can be prepared from the nucleophilic substitution of another alkyl halide CCl4 in the presence of excess HF. CCl4 + 2HF -----> CF₂Cl2 + 2HCI. rate = k[CCl4] How long will it take for this reaction to reach 90% completion if the the rate constant for the reaction is 1.5 x 10- 4 5-1? Give your answer in hours to 1 d.p. Time required: hours
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In radical chlorination of alkanes, non-equivalent hydrogens react with chlorine atoms at different rates. At 35 °C, prim These are conditions of kinetic control where product ratios are determined by relative rates of formation. For example, Consider chlorination of the alkane below at 35 °C. 1. Specify the most reactive C-H bonas), a-c. Two non-equivalent C-H bonds of comparable reactivity should be separated by commas, i.e a.c. 2. Specify the site of chlorination in the major monochloro substitution product, a-c. Two products that form in comparable quantities should be separated by commas, 1.e. a.c Submit Answer Retry Entire Group 2 more group attempts remaining
1. For the rearrangement of cyclopropane to propene at 500°C, the following data have been obtained: [(CH2)3], M (CH2), CH,CH=CH2 2.98 x10- 5.55 x10-2 1.60 x10- 8.56x10-3 time, min 15.5 31.0 46.5 What is the rate of disappearance of (CH2); over the time period from 0 to 15.5 minutes? 1. a. 0.00166 M/min b. 0.00127 M/min 0.00101 M/min d. 0.000890 M/min e. 0.000480 M/min C.
In radical chlorination of alkanes, non-equivalent hydrogens react with chlorine atoms at different rates. At 35 °C, primary, secondary, and tertiary C-H bonds react at relative rates of 1: 3.9 : 5.2 respectively. These are conditions of kinetic control where product ratios are determined by relative rates of formation. For example, if A is formed twice as fast as B, the A:B product ratio will be 2. Consider chlorination of the alkane below at 35 °C. 1. Specify the most reactive C-H bond(s), a-c. Two non-equivalent C-H bonds of comparable reactivity should be separated by commas, i.e. a,c. 2. Specify the site of chlorination in the major monochloro substitution product, а-с. Two products that form in comparable quantities should be separated by commas, i.e. a,c
In radical chlorination of alkanes, non-equivalent hydrogens react with chlorine atoms at different rates. At 35 °C, primary, secondary, and tertiary C-H bonds react at relative rates of 1 : 3.9: 5.2 respectively. These are conditions of kinetic control where product ratios are determined by relative rates of formation. For example, if A is formed twice as fast as B, the A:B product ratio will be 2. Consider chlorination of the alkane below at 35 °C. 1. Specify the most reactive C-H bond(s), a-c. Two non-equivalent C-H bonds of comparable reactivity should be separated by commas, 1.e. a,c. 2. Specify the site of chlorination in the major monochloro substitution product, a-c. Two products that form in comparable quantities should be separated by commas, I.e. a,c
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