Question

Arrange in increasing dipole moment ch3i,ch3br,ch3f,ch3cl

Answer 1

Explanation:

CH3Cl>CH3F>CH3Br>CH3I

CH3F should have greatest Dipole moment but it's exception due to its small bond length

Answer 2

Answer:

Among the Cl, Br, F and I halogens, F has the highest electronegativity. But in CH3F, because of the less distance between F and C, dipole moment decreases. Hence the  increasing dipole moment is

CH3Cl > CH3F > CH3Br > CH3I.

Explanation:

• Halogen bond length  depends on the electronegativity difference between  halogen and Carbon . As the difference increases,  bond length decreases.
• A dipole moment arises in any system when there is a separation of charge.  Due to the difference in electronegativity between two chemically bonded atoms, dipole moments occur.
• The dipole moment depends on the electronegativity of halogens.
• When a nucleophile , an electron pair donor, reacts with an electron pair acceptor , the reaction is known as nucleophilic substitution reaction.
• In case of dipole moment, the atom with high electronegativity will attract the electrons more towards itself and it will have high dipole moment.

• Therefore, the increasing order of dipole moment is as follows.
• CH3Cl > CH3F > CH3Br > CH3I.