Table of Contents
What is Drago rule in chemistry?
According to drago,s rule when the following conditions are satisfied, then the energy difference between the participating atomic orbitals will be very high and thus no mixing of orbitals or hybridization takes place. Atleast one lone pair must be present on the central atom.
Is Drago rule in JEE mains?
Yes, it is only strictly valid to P block elements and only to the compounds shown above which are specifically called as DRAGO’S COMPOUNDS. This rule is applicable to elements below 2nd period (i.e doesn’t include Nitrogen and Oxygen) and those which have Hydrogen exclusively as the side atom.
What is Nbepr?
Non Bonding Electron Pair Repulsion Theory (NBEPR)
Why there is no hybridisation in PH3?
But in reality, PH3 molecule has no hybridisation. This is because it a Drago molecule. Drago molecules do not have any hybridisation and have the least bond angles. PH3 does not have any hybridisation as it forms all bonds using it’s pure p orbitals.
Which of the following is a Drago molecule?
PH3 is regarded as a Drago molecule. For the pure ‘p’ orbitals that hold the electrons involved in bond formation, the bond angle is nearly 900.
Is h2o Drago molecule?
According to Drago rule, H2S is a Drago Compound, and Drago compounds tend to have bond angle around 90°. On the other hand, H20 has a bond angle of around 104°. Drago Rule: If central atom belongs to third or higher period, side atom has E.N. As a result, their bond angle stays around 90°.
What is Bent’s law?
Bent’s rule is that in a molecule, a central atom bonded to multiple groups will hybridise so that orbitals with more s character are directed towards electropositive groups, while orbitals with more p character will be directed towards groups that are more electronegative.
Why P do not form PH5?
In PH5 size of Phosphorus is very large and that of Hydrogen is very small ,and hence there is no effective overlapping between them because the energy released in this process is not enough to unpair the electrons of Phosphorus. Therefore PH3 can be formed whereas PH5 is never formed. Thankyou.
Why does PH3 exist?
In case of PH5, The P atom uses sp3d hybrid orbitals. Since d orbital has higher energy than s and p orbitals. PH3 is possible because only s and three p orbitals are used which can be hybridise easily due to their equal energy.
What is the application of Drago’s rule?
Drago’s rule is an empirical rule and is used to explain the bond angles of hydrides of group 15 and 16 of or below 3rd period. So essentially it is only applicable for PH3, AsH3,SbH3 and H2S,…
What is a Drago compound?
There are not really Drago compounds/Not-Drago compound. Drago came up with a set of rules to be used for predicting the bond angles in compounds derived from elements in the 3rd-6th periods and group 14, 15, and 16. The rules are something like:
What is the effect of Drago’s effect on hybridization?
Also, as a result of Drago’s effect when atoms of group 14, 15 and 16 (belonging to third period and above) are attached to atoms having electronegativity less than 2.5 then it has valence electrons in pure s-orbitals. And apparently no hybridization effect is observed in such cases.