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Halides of Group 16

In chlorinati...

Question

In chlorination the relation rate of abstraction of H in $3^{\circ}, 2^{\circ}$ and $1^{\circ} C$ atom respectively

A

5 : 3.8 : 2

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B

5 : 3.8 : 1

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C

1600 : 82 : 1

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D

1600 : 5 : 82

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Solution

The correct option is B
5 : 3.8 : 1

The chlorination of alkanes proceeds through the formation of alkyl free radical and the order of stability of free radical is $3^{\circ} > 2^{\circ} > 1^{\circ} C . T h e t e r t i a r y 3^{\circ}$ radical is more stable because it has more number of Hyper conjugative structures. Therefore the relative rate of abstraction of H in $3^{\circ}, 2^{\circ}$ and $1^{\circ}$ C atom is 5 : 3.8 : 1.

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Q. Halogenation is a substitution reaction, where halogen replaces one or more hydrogens of hydrocarbon.
Chlorine free radical make

1^{\circ}, 2^{\circ}, 3^{\circ}

radicals with almost equal ease, whereas bromine free radicals have a clear preference for the formation of tertiary free radicals. So , bromine is less reactive, and more selective whereas chlorine is less selective and more effective.
The relative rate of abstraction of hydrogen by Br is

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The relative rate of abstraction of hydrogen by Cl is

3^{\circ} (5) > 2^{\circ} (3.8) > 1^{\circ} (1)

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Q. Halogenation is a substitution reaction, where halogen replaces one or more hydrogens of hydrocarbon.
Chlorine free radical make

1^{\circ}, 2^{\circ}, 3^{\circ}

radicals with almost equal ease, whereas bromine free radicals have a clear preference for the formation of tertiary free radicals. So , bromine is less reactive, and more selective whereas chlorine is less selective and more effective.
The relative rate of abstraction of hydrogen by Br is

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3^{\circ} (5) > 2^{\circ} (3.8) > 1^{\circ} (1)

F. What would be the product ratio x/y in the chlorination of propane if all the hydrogen were abstracted at equal rate ?

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Q. Halogenation is a substitution reaction, where halogen replaces one or more hydrogens of hydrocarbon.
Chlorine free radical make

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radicals with almost equal ease, whereas bromine free radicals have a clear preference for the formation of tertiary free radicals. So , bromine is less reactive, and more selective whereas chlorine is less selective and more effective.
The relative rate of abstraction of hydrogen by Br is

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Chlorine free radical make

1^{\circ}, 2^{\circ}, 3^{\circ}

radicals with almost equal ease, whereas bromine free radicals have a clear preference for the formation of tertiary free radicals. So , bromine is less reactive, and more selective whereas chlorine is less selective and more effective.
The relative rate of abstraction of hydrogen by Br is

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The relative rate of abstraction of hydrogen by Cl is

3^{\circ} (5) > 2^{\circ} (3.8) > 1^{\circ} (1)

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