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In which of the following compounds the carbon marked with asterisk is expected to have greatest positive charge?
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The correct answer is:
${ }^* \mathrm{CH}_3-\mathrm{CH}_2-\mathrm{Cl}$
${ }^* \mathrm{CH}_3-\mathrm{CH}_2-\mathrm{Cl}$
Electronegativity of $\mathrm{Cl}, \mathrm{Br}$, C and $\mathrm{Mg}$ follows the order $\mathrm{Cl}>\mathrm{Br}>\mathrm{C}>\mathrm{Mg}$, thus chlorine has the greatest-I-effect and disperse the positive charge on ' $\mathrm{C}$ ' atom most effectively. Hence, ${ }^* \mathrm{CH}_3-\mathrm{CH}_2-\mathrm{Cl}$ has the greatest positive charge.
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