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Exercise: Radical substitution reactions

Exercise

Radical substitution reactions are fundamentally different from polar substitutions as electrophilic and nucleophilic substitution reactions. Which of the following statements are correct?

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correct

wrong

partly correct

This is the right answer

Radicals attack the center of a molecule.

Radicals attack the periphery of molecules - usually the hydrogen atom of a C-H bond.

In polar substitution reactions, the active agent attacks a radical position in the molecule.

In polar substitution reactions, the active agent attacks an electrophilic or nucleophilic position, respectively, in the molecule.

Radicals attack the periphery of molecules - usually the carbon atom of a C-H bond.

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Exercise

When methane and chlorine gas are mixed at room temperature in the dark, no reaction takes place. Which of the following statements are correct?

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wrong

partly correct

This is the right answer

However, if this blend is heated to about 30 °C or irradiated with ultraviolet light, a vigorous reaction occurs, which yields a product mixture of chlorinated C2 compounds and hydrocarbons.

However, if this blend is heated to about 300 °C or irradiated with ultraviolet light, a vigorous reaction occurs, which yields a product mixture of chlorinated C1 compounds and hydrogen chloride.

No reaction can be seen even if this blend is irradiated with ultraviolet light.

However, if this blend is heated to about 300 °C and irradiated with ultraviolet light, a vigorous reaction occurs, which yields a product mixture of chlorinated C2 compounds and hydrogen chloride.

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Exercise

The calculation of the reaction enthalpy of radical methane chlorination using the enthalpies of the formation of the starting products and products yields -99.4 kJ/mol.

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wrong

partly correct

This is the right answer

Thus, the reaction is very endothermic.

This result does not necessarily mean that the reaction visibly runs at room temperature.

Thus, the reaction is very exothermic.

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