In an S_N2 substitution reaction of the type which $straight R minus Br space plus space Cl to the power of minus space rightwards arrow with DMF on top space straight R minus space Cl space plus space Br to the power of minus$ one of the followings has the highest relative rate?

CH₃-CH₂-CH₂Br

CH₃-CH(CH₂)-CH₂Br

CH₃C(CH₃)₂CH₂Br

CH₃CH₂Br

Solution

CH₃CH₂Br

The relative reactivity of alkyl halide towards S_N N reactions is as follows;
Primary > secondary > Tertiary
However, if the primary alkyl halide or the nucleophile/base is sterically hindered the nucleophile will have difficulty to getting the back side of the alpha carbon as a result of this elimination product will be predominant. Here CH₃CH₂Br is the least hindered, hence it has the highest relative rate towards S_N2 reaction.

Some More Questions From Haloalkanes and Haloarenes Chapter

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Haloalkanes And Haloarenes

Some More Questions From Haloalkanes and Haloarenes Chapter

Among the isomeric alkanes of molecular formula C₅H₁₂, identify the one that on photochemical chlorination yields:

i) A single monochloride.

Among the isomeric alkanes of molecular formula C₅H₁₂, identify the one that on photochemical chlorination yields:

i)Three isomeric monochlorides.

Among the isomeric alkanes of molecular formula C₅H₁₂, identify the one that on photochemical chlorination yields:
Four isomeric monochlorides.

Draw the structures of major monohalo products in each of the following reactions:

Draw the structures of major monohalo products in each of the following reactions:

Draw the structures of major monohalo products in each of the following reactions:

Draw the structures of major monohalo products in each of the following reactions:

Draw the structures of major monohalo products in each of the following reactions:

Arrange each set of compounds in order of increasing boiling points:
Bromomethane, Bromoform, Chloro-methane, Dibromomethane.

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Haloalkanes And Haloarenes

In an SN2 substitution reaction of the type which one of the followings has the highest relative rate? CH3-CH2-CH2Br CH3-CH(CH2)-CH2Br CH3C(CH3)2CH2Br CH3CH2Br

Some More Questions From Haloalkanes and Haloarenes Chapter

Among the isomeric alkanes of molecular formula C5H12, identify the one that on photochemical chlorination yields:i) A single monochloride.

Among the isomeric alkanes of molecular formula C5H12, identify the one that on photochemical chlorination yields:i)Three isomeric monochlorides.

Among the isomeric alkanes of molecular formula C5H12, identify the one that on photochemical chlorination yields:Four isomeric monochlorides.

Draw the structures of major monohalo products in each of the following reactions:

Draw the structures of major monohalo products in each of the following reactions:

Draw the structures of major monohalo products in each of the following reactions:

Draw the structures of major monohalo products in each of the following reactions:

Draw the structures of major monohalo products in each of the following reactions:

Arrange each set of compounds in order of increasing boiling points:Bromomethane, Bromoform, Chloro-methane, Dibromomethane.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Among the isomeric alkanes of molecular formula C₅H₁₂, identify the one that on photochemical chlorination yields:

i) A single monochloride.

Among the isomeric alkanes of molecular formula C₅H₁₂, identify the one that on photochemical chlorination yields:

i)Three isomeric monochlorides.

Among the isomeric alkanes of molecular formula C₅H₁₂, identify the one that on photochemical chlorination yields:
Four isomeric monochlorides.

Arrange each set of compounds in order of increasing boiling points:
Bromomethane, Bromoform, Chloro-methane, Dibromomethane.