Question

Which halide has the smallest dipole moment ch2cl2?

Answer 1

Answer:

Explanation:

Arrange CH4, CH3Cl, CH2Cl2, CHCl3 , CCl4 in decreasing order of polarity.. Now first of all CCl4 and CH4 have tetrahedral shape and are symmetric so they have dipole moment zero... In CH3Cl the polarity vectors of 3 H atoms and Cl atoms add up and give it a large dipole moment..The resultant of 2 C-Cl bond and 2 C-H bond will be nearly in same direction which increases total dipole moment. However, in CHCl3 the resultant of 3 C-Cl bond makes some angle with C-H bond which relatively decreases total dipole moment.CH2Cl2 has two dipole moments each of A value. If each has A value, we can vectorially add them and get the dipole of the combination as 2(cos(109.5/2))A. that comes to be 1.14A. CHCl3 will have a dipole moment of A in the opposite direction of the hydrogen by the same logic as above.Dipole moment will be smallest in 1 as only 1 ethyle group is attached which is increasing the e− density on the c=c. II being cis has more dipole moment due to 2−CH3 groups are there. In III dipole moment=O; due to the alignment of CH3 groups.Please, ignore the diagram of CH3Cl as it is not included in the question. The resultant of 2 C-Cl bond and 2 C-H bond will be nearly in same direction which increases total dipole moment. However, in CHCl3 the resultant of 3 C-Cl bond makes some angle with C-H bond which relatively decreases total dipole moment.