Q: Why is o- hydroxy benzaldehyde a liquid whereas p-hydroxy benzaldehyde a solid , with high MP, at room temperature ? A: o- hydroxy benzaldehyde

Q: Why is o- hydroxy benzaldehyde a liquid whereas p-hydroxy benzaldehyde a solid , with high MP, at room temperature ? A: o- hydroxy benzaldehyde
We continue to study the physical manifestations of H- bonds and their importance. Protein folding Hydrogen bonds are an integral part of the protein structure.
We studied hydrogen bonding in the last two posts. In this post, we will study the types of this bonds and their implications . The H-bond
I take immense pride in writing the 100th post on this blog. I am glad that I could continue writing throughout my pregnancy, after my daughter was
In this post we start discussing a type of secondary bonding, without which life would not be possible !! How is hydrogen bonding and life
S2.Induced dipole– Induced dipole interactions. Vander Waals bond , London dispersion force and induced dipole – induced dipole interactions all mean the same. This type of
We have already seen in post # 54 that the main difference between primary and secondary bonding is that in secondary bonding THERE IS NO
As we discussed in the last post , the free electron gas model is not infallible. Almost 30 years after the electron gas model was
P3.THE METALLIC BOND. In this post we shall discuss the last kind of primary bond – The metallic bond. We see many objects in our everyday
This post is dedicated to studying the co-ordinate covalent. This is a bond formed between an electron rich and an electron poor species. Electron rich
CO in high concentration is fatal in less than 5 mins !! The worst part is that this is an odorless and colorless gas and
From this post onwards, we shall study some examples and learn how bonds are formed between two different atoms. Hydrogen fluoride (HF) – We
With this post we start discussing MOT theory for diatomic heteronuclear molecules – molecules formed by two different atoms. The MO diagrams for heteronuclear atoms
Fluorine molecule (F2) – F (9) 1s2 2s2 2p5 Two fluorine atoms bring 7 electrons each to the table and thus the 10 electrons get arranged
Nitrogen molecule (N3) – N (7) 1s2 2s2 2p3 When we construct the MO diagram for nitrogen , we will only draw the valence 2s and
Helium molecule (He2) – He (2) – 1s2. Helium has two electrons in the 1s orbital. Thus, when we draw the MO diagram, two electrons
Pi Symmetry Orbitals with pi symmetry are NOT symmetric w.r.t to the internuclear axis. When rotated around the axis, they produce a phase change (which
Overlaps & Symmetry Based on how the bonds are formed, the interaction between two AOs can have following symmetry- i) Sigma (σ) ii) Pi (π
SYMMETRY OF MOLECULAR ORBITALS. Based on symmetry ,the orbitals can be classified as – GERADE MOs and UNGERADE MOs. Gerade MOs ⇒ Gerade = Even
In this post we shall begin by constructing MO diagrams. We shall begin with the simplest of all homonuclear diatomic molecules – The H2 molecule.
We have seen in the periodic table series , that the electronic configuration tells us where exactly the electron is. Configuration means order… so
LINEAR COMBINATION OF ATOMIC ORBITALS (LCAO approximation) MOT is incorporated in quantum mechanics. As we have already discussed that classical physics (physics
Molecular orbital theory(MOT) is a quantum mechanical approach to bonding.Thus, this theory considers an orbital as a wave function(ψ).In order to understand MOT , it
Q: Which of the following statements for bond angles (θ) in CH4 and CH2F2 molecules is true – A] θ CH4 > θ CH2F2 B] θ CH4 < θ CH2F2 C] θ
Q: Why does PCl5 exists but NCl5 does not? A. Ionization energy of N is very high B.N does not have vacant d- orbitals C.It does not
How compounds exist in solid state ? Compounds exist as ions in solid state. Consider the following example – PCl5 molecule – This molecule has
Example 3 – PCl3F2 molecule . This molecule has TBP geometry with two F atoms and three Cl atoms as substituents.According to Bent’s rule –
After having learnt the statement of Bent’s rule in the earlier post , let us now study the rule with some examples. We know that bond angle(θ) ∝
In this post we are going to learn a comparatively new rule, proposed by Henry Bent.Henry Bent (1926-2015) was an American physical chemist who
We have already studied that the angle between the central and terminal atoms of a molecule is called as a bond angle.In this post we