Which of the following has the minimum bond length?

1.	${\mathrm{O}}_2^{-}$	2.	${\mathrm{O}}_2^{2-}$
3.	${\mathrm{O}}_2^{}$	4.	${\mathrm{O}}_2^{+}$

In which one of the following species the central atom has the type of hybridization which is not the same as that present in the other three ?

1. ${\mathrm{SF}}_4$

2. ${\mathrm{I}}_3^{-}$

3. ${\mathrm{SbCl}}_5^{2-}$

4. ${\mathrm{PCl}}_5$

According to the MO theory, which of the following lists ranks the nitrogen species in terms of increasing bond order?

1. $N_2^{-}<N_2<N_2^{2-}$

2. $N_2^{2-}<N_2^{-}<N_2$

3. $N_2<N_2^{2-}<N_2^{-}$

4. $N_2^{-}<N_2^{2-}<N_2$

The correct order of \(\mathrm{C-O}\) bond length among \(\mathrm{CO},\mathrm{CO}_3^{2-},\) and \(\mathrm{CO_2}\) is :

1. \(\mathrm{CO}_2<\mathrm{CO}_3^{2-}<\mathrm{CO} \)
2. \(\mathrm{CO}<\mathrm{CO}_3^{2-}<\mathrm{CO}_2 \)
3. \(\mathrm{CO}_3^{2-}<\mathrm{CO}_2<\mathrm{CO} \)
4. \(\mathrm{CO}<\mathrm{CO}_2<\mathrm{CO}_3^{2-}\)

Which of the following is not a correct statement?

Which of the following is not isostructural with SiCl₄?

1. \(SCl_4\)

2. \(SO_4^{2-}\)

3. \(PO_4^{3-}\)

4. \(NH_4^+\)
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Which of the following diatomic molecular species has only $\mathrm{\pi }$ bonds according to Molecular Orbital Theory?

1.  Be₂

2.  O₂

3.  N₂

4.  C₂

The number of sigma ($\mathrm{\sigma }$) and pi ($\mathrm{\pi }$) bonds in pent-2-en-4-yne is:

1. 13 $\mathrm{\sigma }$ bonds and no $\mathrm{\pi }$ bond

2. 10 $\mathrm{\sigma }$ bonds and 3 $\mathrm{\pi }$ bonds

3. 8 $\mathrm{\sigma }$ bonds and 5 $\mathrm{\pi }$ bonds

4. 11 $\mathrm{\sigma }$ bonds and 2 $\mathrm{\pi }$ bonds

The correct structure of tribromo octoxide is:

Which of the molecule is not hypovalent but complete octet :

1. AlCl₃                   

2. AlBr₃

3. AlF₃                     

4. BF₃