Mathematics of Dipole Moment

Q.

What are Sawhorse projections in organic chemistry?

Q. Ortho-chloro phenol is less polar than O-fluoro phenol. Why?

1. Intra molecular H-bonding
2. Inter molecular Hydrogen bonding
3. Size of Cl as compared to size of F
4. Cl is a gas

Q. A diatomic molecule has dipole moment of 1.2 D. If the bond distance is $1.0\stackrel{\circ }{A}$, what fraction of charge e exists on each atom?

1. 1

2. 0.5

3. 0.25

4. 0.125

Q. Calculate the fractional charge on Bromine atom in HBr. Given dipole moment of HBr = 0.78 D, bond distance of HBr = $1.41\stackrel{\circ }{A}$, electronic charge e = $4.8\times {10}^{-10}$ e.s.u

1. $+0.11$
2. $-0.11$
3. $-0.22$
4. $+0.22$

Q. Which of the following has a zero dipole moment?

1. $C{O}_2$
2. $N{H}_3$
3. $N{F}_3$
4. $H_{2}O$

Q. Which of the following description of hybridisation is not correct?

1. $[Fe{F}_6{]}^{3-},s{p}^3{d}^2$
2. $\left[Fe\right(CN{)}_6{]}^{4-},d^2{s}^3$
3. $\left[Cu\right(N{H}_3{)}_4{]}^{2+},s{p}^3$
4. $\left[Ni\right(CO{)}_4],s{p}^3$

Q.

The maximum number of compounds that have the same net dipole moment is? The dipole moment $\mu$ of $C-Cl$ = 1.5D

(1) $Ph-Cl$

(2)(3)

(4)(5)(6)

1. 1

2. 2

3. 4

4. 3

Q.

The values of EN of A and B are 1.2 and 4.0 respectively. $\%$ ionic character in bond A - B is

1. $50\%$

2. $43\%$

3. $55.3\%$

4. $72.24\%$

Q. If the observed dipole moment of HF is 1.944 D and the bond length of HF is 90 pm. Find the $\%$ covalent character of HF.