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Why is the Dipole moment of CH3F less than CH3Cl though it should be opposite??

Why is the Dipole moment of CH3F less than CH3Cl though it should be opposite??

Grade:11

8 Answers

kiran kumar pidikiti
15 Points
13 years ago

since the size of  F atom is small , the bond moment of C-F   is small than the bond moment of C-Cl

because of the large size of the chlorine atom

Himanshu Dogra
34 Points
13 years ago

But F is more electronegative than Cl. Also, by your answer, CH3I should have higher dipole moment than CH3Cl but this is opposite.

Chantayya Badugu B
27 Points
11 years ago

CH3Cl has larger dipole moment than CH3F because dipole moment is based on the product of distance and charge, and not just charge alone.

Fluorine is more electronegative than chlorine, but, the carbon-fluorine bond is also much shorter than the carbon-chlorine bond: 139 pm vs 178 pm. Thats why the dipole moment of chloromethane is higher than the dipole moment of fluoromethane.

Harshit Shah
45 Points
8 years ago
As the size of fluorine is less compared to chlorine the bond pair electrons of carbon-fluorine bond will get repelled by the lone pair electrons of fluorine. So the dipole moment will decrease.While this ill not happen in choromethane.
 
Pankaj
19 Points
6 years ago
As dipole moment depend on product of charge and distance between atom . Chlorine have exceptionally large size than fluorine and it have more partial charge than flourine.
Shubham Kumar
13 Points
6 years ago
CH3Cl has higher dipole moment then CH3F because dipole moment is product of charge and distance between atoms In case of F the distance is very less as compared to that of Cl
Aryan
19 Points
6 years ago
It`s because of exceptionally small size of flourine dude take it easy it`s just an exception nothing to worry
Kushagra Madhukar
askIITians Faculty 628 Points
3 years ago
Dear student,
Please find the answer to your question.
 
CH3Cl has larger dipole moment than CH3F because dipole moment is based on the product of distance and charge, and not just charge alone.
Fluorine is more electronegative than chlorine, but, the carbon-fluorine bond is also much shorter than the carbon-chlorine bond: 139 pm vs 178 pm. Thats why the dipole moment of chloromethane is higher than the dipole moment of fluoromethane.
 
Thanks and regards,
Kushagra

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