Q. Which chlorine atom is more electronegative in the following?
A) $CH_{3} - \ Cl$
B) $CH_{3} - CH_{2} - Cl$
C) $CH_{3}$
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$H - C - Cl$
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$\ \ \ \ \ \ \ \ CH_{3}$
D) $\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ CH_{3}$
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$CH_{3} - CH_{2} - C - Cl$
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$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ CH_{3}$
Explanation
(d)
More the number of hyperconjugated structures, more will be electronegative chlorine atom.
(a) $CH_{3} - Cl$
3-hyperconjugated structures
(b) $CH_{3} - CH_{2} - Cl$
2-hyperconjugated structures
(c) $CH_{3}$
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$\ \ \ \ \ \ \ \ \ H - C - Cl$
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$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ CH_{3}$
6- hyperconjugated structures
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ CH_{3}\ \$
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(d) $CH_{3} - CH_{2} - C - Cl$
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$CH_{3}$
8-hyperconjugated structures
$\because$ 8-hyperconjugated structures are possible for (d)
∴Chlorine in this is most electronegative.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.