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Q.

With the help of the following equations and data choose the wrong statement.I. CH3⋮⋮H⟶C∙H3+H∘Eact=+435.1kJII. CH3−CH2⋮⋮H⟶CH3C˙H2+H∙Eact=+410.0kJIII. CH3⋮⋮CH3⟶2C∙H3Eact=+368.0kJIV. CH3CH2⋮⋮CH2CH3⟶2CH3C∙H2 Eact=+368.0kJV. CH3CH2CH2⋮⋮CH3⟶CH3CH2C∙H2+CH∙3Eact=355.6kJ

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a

Thermal cracking of (C-H) bond of methane occurs at 1500 K and that of (C-H) bond of ethane breaks at 800-900 K.

b

During homolysis of ethane at high temperature, the (C-C) bond breaks more radily than (C-H) bonds.

c

During the cracking of n-butane, reaction (IV) occurs more readily than reaction (V).

d

Formation of CH3CH˙2, radical by reaction (II) will takeplace at lower temperature than the formation of C∙2H5 radical by reaction (IV).

answer is D.

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Detailed Solution

Lower the Eact. of first step of chain propagation reaction, more easily the bond can be broken. Also this bond breaking will take place comparatively at a lower temperature.
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With the help of the following equations and data choose the wrong statement.I. CH3⋮⋮H⟶C∙H3+H∘Eact=+435.1kJII. CH3−CH2⋮⋮H⟶CH3C˙H2+H∙Eact=+410.0kJIII. CH3⋮⋮CH3⟶2C∙H3Eact=+368.0kJIV. CH3CH2⋮⋮CH2CH3⟶2CH3C∙H2 Eact=+368.0kJV. CH3CH2CH2⋮⋮CH3⟶CH3CH2C∙H2+CH∙3Eact=355.6kJ