Question

Which of the following compounds has the highest dipole moment $(D)$ ?

• A. $HBr$
• B. $CH _{3} COCH _{3}$
• C. $H _{2} S$
• D. $COCl_{2}$

Answer 1

Answer: (B)

(a) Dipole moment of $HBr$



(b) Dipole moment of acctone



due to methyl group, (ERG) lies in direction of oxygen therefore, net dipole moment increases.

$\mu_{\text {net }}=2.69 \,D$

(c) Dipole moment of $H _{2} S$



(d) Dipole moment of $COCl _{2}$



due of $Cl$ atom net dipole moment decreases.

$\mu_{ net }=0.69\, D$

Hence, acetone has highest dipole moment