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Physical Properties of Alkenes

Which of the ...

Question

Which of the following statement regarding free radical halogenation of alkane is not true?

A

Hydrogen abstraction by halogen radical in the propagation step is exothermic in both chlorination and bromination

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B

Hydrogen abstraction by halogen radical in the propagation step is exothermic in cholorination but endothermic in bromination

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C

A single halogen radical may bring about halogenation to thousands of alkane molecule

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D

Continuous source of energy is required to continue the halogenation reaction

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Solution

The correct option is A Hydrogen abstraction by halogen radical in the propagation step is exothermic in both chlorination and bromination
Hydrogen abstraction by halogen radical in the propagation step is exothermic in chlorination but endothermic in bromination. Hence, the option (A) is an incorrect statement.

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Q. Which of the following statement regarding free radical halogenation of alkane is not true?
(A) Hadrogen abstraction by halogen radical in the propagation step is exothermic in both chlorination and bromination
(B) Hydrogen abstraction by halogen radical in the propagation step is exothermic in cholorination but endothermic in bromination

Q. Halogenation takes place by free-radical mechanism. The values of

E

for chain initiation and chain propagation steps and enthalpy of overall reaction of halogens with alkane are given. Match the values with the type of halogens.

Q. The reactivity order of halogenation of alkanes is

F_{2} > C l_{2} > B r_{2} > I_{2}

. Choose the correct statements.
(I) Lower the activation energy for the chain initiation step, more reactive is the halogen.
(II) Lower the activation energy for the first chain-propagation step, more reactive is the halogen.
(III) Lower the activation energy for the second chain-propagation step, more reactive is the halogen.
(IV) More negative is the overall heat of the reaction (

Δ H_{r}^{o}

of the halogenation of alkane) more reactive is the halogen.

Q. Which of the statements is/are true about the reactivity order of halogens

F_{2} > C l_{2} > B r_{2} > I_{2} .

I. Lower the activation energy for the chain initiation step, more reactive is the halogen.
II. Lower the activation energy for the first chain propagation step, more reactive is the halogen.
III. More negative is the overall heat of the reaction

(Δ H_{r})

of halogenation of alkane, more reactive is the halogen.
IV. Lower the activation energy for the second chain-propagation step, more reactive is the halogen.

Q. During halogenation of alkanes, the halogens and alkane show a specific trend. Which of the following statements is not correct?

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