Electronegativity

Q. Which of the following options is/are true about the molecule $C{H}_2=S{F}_4$ ?

1. 6 atoms of the molecule are in the vertical plane.
2. 4 atoms of the molecule are in the horizontal plane.
3. CS $\pi$ bond is formed by the overlap of $p_y$ of C atom and $d_{xy}$ of S atom.
4. The nodal plane of the $\pi$ bond contains 4 atoms of the molecule.

Q. Which of the following relation is correct?
$\text{(IE = Ionisation energy in eV/atom, EA = Electron affinity in eV/atom, EN = Electronegativity in Mulliken scale)}$

1. $\text{2IE - EA - EN = 0}$
2. $\text{2EN - IE - EA = 0}$
3. $\text{2EA - IE - EN = 0}$
4. $\text{EN - IE - EA = 0}$

Q. The outermost electronic configuration of the most electronegative element is

1. $2s^{2}2p^3$
2. $2p^{2}2p^4$
3. $2s^{2}2p^5$
4. $3s^{2}3p^5$

Q. The correct order of bond angles among the following:

1. $O{F}_2>H_{2}O$
2. $OC{l}_2>OB{r}_2$
3. $C{H}_4>N{H}_3$
4. All of the above

Q. Calculate the electronegativity of fluorine from the following data:
Bond energy of H-H bond $E_{H-H}=104.2kcalmo{l}^{-1}$
Bond energy of F-F bond$E_{F-F}=36.6kcalmo{l}^{-1}$
Bond energy of H-F bond $E_{H-F}=134.6kcalmo{l}^{-l}$
Electronegativity of Hydrogen $X_H=\mathrm{2.1.}$

1. 3.87
2. 2.76
3. -3.87
4. -2.76

Q.

Which carbon atom will show minimum electronegativity -

H ${}^{1}C$ $\equiv$ ${}^{2}C$ - C${}^{3}H$ - C${}^{4}H$ - C${}^{5}H$

1. Fifth

2. Third

3. First

4. Second

Q. Hyper conjugation is not possible in

1. $H_{3}C-CH=C{H}_2$
2. $H_{2}C=C{H}_2$
3. 
4. $(C{H}_3{)}_{2}C=C(C{H}_3{)}_2$

Q.

The outermost electronic configuration of the element with least electronegativity among the following is?

1. 2$s^2$2$p^5$

2. 3$s^2$3$p^6$

3. 2$s^2$2$p^4$

4. 6$s^2$6$p^6$7$s^1$

Q. Identify the correct statement (s) among the following:

1. The electronegativity of an element is the tendency of an isolated atom to atttract an electon
2. The second ionization potential of boron is greater than carbon
3. Nitrogen has postive electron gain enthalpy eventhough it is an electronegative element
4. The first electron affinity of fluorine is greater than that of chlorine

Q. The electronegativity difference between N and F is greater than N and H, yet the dipole moment of $N{H}_3$ (1.5 D) is greater than that of $N{F}_3$ (0.2 D). This is because:

1. In $N{H}_3$ as well as $N{F}_3$, the overall molecular dipole and bond dipoles are in the opposite direction
2. In $N{H}_3$, the overall molecular dipole and bond dipoles are in the opposite direction, whereas in $N{F}_3$, these are in the same direction.
3. In $N{H}_3$ as well as in $N{F}_3$ the overall molecular dipole and bond dipoles are in the same direction
4. In $N{H}_3$, the overall molecular dipole and bond dipoles are in the same direction, whereas in $N{F}_3$ these are in the opposite direction

Q. If ${\in }_{C-C}=348{\text{kJmol}}^{-1},{\in }_{C-H}=412{\text{kJmol}}^{-1}\text{and}{\in }_{H-H}=-436{\text{kJmol}}^{-1}$, the Pauling electronegativity of $C$ is about ______. (Given: electronegativity of $H$ = 2.1)

1. 1.64
2. 1.8
3. 2.58
4. 2.91

Q. The correct order of increasing $X-O-X$ bond angle is $(X=H,F\text{or}Cl)$:

1. $H_{2}O>C{l}_{2}O>F_{2}O$
2. $C{l}_{2}O>H_{2}O>F_{2}O$
3. $F_{2}O>C{l}_{2}O>H_{2}O$
4. $F_{2}O>H_{2}O>C{l}_{2}O$

Q. Electronegativity does not depend on the hybridized state.

1. False
2. True

Q.

Which carbon atom will show minimum electronegativity -

H ${}^{1}C$ $\equiv$ ${}^{2}C$ - C${}^{3}H$ - C${}^{4}H$ - C${}^{5}H$

1. Fifth

2. Third

3. First

4. Second

Q. The electronegativity of $H,X,O$ are $2.1,0.8$ and $3.5$ respectively. Comment on the nature of the compound $H-O-X$ , that is:

1. Basic
2. Acidic
3. Atmospheric
4. Can't be predicted