In which molecule all atoms are coplanar?

1. $C{H}_4$

2. $B{F}_3$

3. $P{F}_3$

4. $N{H}_3$

Among the following which is paramagnetic?

1. \(\text{Cl}_2 \text{O}_6\)
2. \(\text{Cl}_2 \text{O}_7\)
3. \(\text{Cl}_2 \text{O}\)
4. \(\text{ClO}_2\)

The correct statement among the following for a compound having a higher dipole moment is-

$N{F}_3$ is:

(1) non-polar compound 

(2) electrovalent compound 

(3) having low value of dipole moment than $N{H}_3$

(4) having more dipole moment than $N{H}_3$

Polarization of electrons in acrolein may be written as: 

1. $\stackrel{{\delta }^{-}}{C}{H}_2=CH-\stackrel{{\delta }^{+}}{C}H=O$

2. $\stackrel{{\delta }^{-}}{C}{H}_2=CH-CH=\stackrel{{\delta }^{+}}{O}$

3. $\stackrel{{\delta }^{-}}{C}{H}_2=\stackrel{{\delta }^{+}}{C}H-CH=O$

4. $\stackrel{{\delta }^{+}}{C}{H}_2=CH-CH=\stackrel{{\delta }^{-}}{O}$

$PC{l}_5$ exists but $NC{l}_5$ does not because:

1. Nitrogen has no vacant d-subshells .

2. $NC{l}_5$ is unstable .

3. Nitrogen atom is much smaller than p .

4. Nitrogen is highly inert . 

The bond angle between two hybrid orbitals is ${105}^{°}$. The % s character in orbital is-

Which bond angle would result in the maximum dipole moment for the triatomic molecule $X{Y}_2$ 

1. ${90}^{°}$

2. ${120}^{°}$

3. ${150}^{°}$

4. ${180}^{°}$

The strongest hydrogen bond present among the following is-

1. $\mathrm{O}—\mathrm{H}‐‐‐\mathrm{S}$

2. $\mathrm{S}—\mathrm{H}‐‐‐\mathrm{O}$

3. $\mathrm{F}—\mathrm{H}‐‐‐\mathrm{F}$

4. $\mathrm{F}—\mathrm{H}‐‐‐\mathrm{O}$

In which of the process, the bond order increases and magnetic behaviour changes?

(a) $N_2\to {N_2}^{+}$

(b) $C_2\to {C_2}^{+}$

(c) $NO\to N{O}^{+}$

(d) $O_2\to {O_2}^{+}$