Incorrect statement about peptide bond is:
 

1.	C–N bond length in proteins is longer than the usual bond length of N-bond.
2.	Spectroscopic analysis shows the planar structure of  group.
3.	C–N bond length in proteins is smaller than the usual bond length of the C–N bond.
4.	None of the above.

Which of the following two species in the pair are isostructural:

1.  $Xe{F}_2$ $,$ $I{F}_2^{-}$

2. $N{H}_3$ $,$ $B{F}_3$

3. $$ $C{O}_3^{-2}$ $,$ $S{O}_3^{-2}$

4. $PC{l}_5$ $,$ $IC{I}_5$

The bond angle is maximum in:

1. $N{H}_3$

2. $N{H}_4^{+}$

3. $PC{l}_3$

4. $SC{l}_2$

The incorrect statements among the following for sigma- and pi- bonds formed between two carbon atoms is:

If the main axis of a diatomic molecule is z, then the molecular orbital p_x and p_y overlap to form which of the following orbital:

1.  $\mathrm{\pi }$ molecular orbtial
2.  σ molecular orbital
3.  δ molecular orbtial
4.  No bond will form

In NO₃^– ion, the number of bond pair and lone pair of electrons on nitrogen atom are respectively:

 ${\mathrm{p}}_{\mathrm{\pi }}-{\mathrm{d}}_{\mathrm{\pi }}$ bonding is present in:

1. ${\mathrm{NO}}_3^{-}$

2. ${{\mathrm{SO}}_3}^{-2}$

3. ${{\mathrm{BO}}_3}^{-3}$

4. ${{\mathrm{CO}}_3}^{-2}$

Among the following, iso-electronic species are:

1. CO₂, NO₂

2. $N{O}_2^{-}$, CO₂

3. CN^–, CO

4. SO₂, CO₂

The dipole moment of compound AB is 10.92 D and that of compound CD is 12.45 D. If the bond length of AB is 2.72 A° and that of CD is 2.56 A°, then for these compounds the correct statement is:
1.  More ionic nature in AB
2.  More ionic nature in CD
3.  Equal in both
4.  Cannot be predicted

The lone pairs in the BrF₃ molecule, occupy equatorial positions to minimize: