Related Questions:
Saturday, January 23, 2021
What is structure and also explain the bridge bonding of I2Cl6 ?
I2Cl6 is the dimer of ICl3 which is dimerised through (3C-4e-) bridge bonds. And it shape is rectangular planer and all the iodine as well as chlorine atoms lies in same plane. And (I-Cl-I) bridge bond have sp3d2-sp3-sp3d2 hybridization.
Related Questions:
(1) What is the difference between the structure of AlCl3 and diborane?
(2) What is structural feature of monomeric and polymeric Beryllium halides ?
(3) What is bridge bond ? explaine 3C-4e bridge bond with suitable examples .
(4) What is structure of Beryllium chloride ?
(5) What is the structure of Aluminium tetrahydridoborate (Al(BH4)3) ?
(6) What is structure of Al(CH3)3 and also explain the bridge bonding in Al(CH3)3?
(7) The type of overlap in the bridge bond exist in Al2(CH3)6 is
(8) What is structure of diborane?
(9) What is structure of BeH2 in solid state ?
(10) Consider the structure of Al(CH3)3 given below and select the correct option?
(11) Consider Al2(OH)6 compound and calculate the value of (X+Y)/Z Where X= total number of two centre-two electrons (2C-2e) bond, Y= total number of three centre-two electron(3C-2e)bonds, and Z=total number of three centre-four electron (3C-4e) bond;
Wednesday, January 20, 2021
Wave mechanical concept of chemical bonding:
There are two important theories which help the nature of covalent bond on the basis of quantum mechanics:
(1)
Valence bond theory (VBT) (2)
Molecular orbital theory (MOT)
(1) Valence bond theory (VBT):
(1) The valence bond theory given by Heitler
and London to explain how to covalent bond form. And it is extented by Pauling and Slater.
(2) the main point of valence bond theory are given as:
(A) The covalent bond formed by overlapping of half filled orbitals
of valence shell.
(B)The covalent bond requires a pair of electrons with opposite
spins.
(C) The Atomic orbitals come closer to each other from the direction
in which there is maximum overlapping, hence covalent has directional in
nature.
(D) The strength of covalent
bond is directly proportional to extent of overlapping.
(E) The extent of overlapping depends on two factors like nature of
orbitals and nature of overlapping
(1) S-orbital is non directional- less overlapping extent while p,d,f
are directional orbitals hence more overlapping extent.
(2) Co-axial overlapping – extent of overlapping is more while in
collateral overlapping – extent of overlapping is less. The order of strength of co-axial
overlapping is : P-P > S-P > S-S
(3) As the value of principle
quantum number(n) increases the strength decreases: 1-1 > 1-2 >
2-2 > 2-3 > 3-3
(4) If the value of value of principle quantum number(n) is same then bond strength
order follow as:
2p-2p > 2s-2p >2s-2s
1s-2p > 2s-2p > 3s-3p
(5) The electron which is already paired in valency shell can enter
into bond formation, it they can be unpaired first and shift to vacant orbitals of slightly
higher energy of same energy shell, this point can explain the trivalency of
boron, tetravalency of carbon, penta-valency of phosphorous etc.
(6) There are two type of
covalent bonds on basis of way of overlapping.
(A) Sigma bond (B) Pi bond
What is Sigma Bond ?
Related Questions:
(1) Why aqueous solution of AlCl3 is acidic in nature ?
(2) What happen when aq AlCl3 react with Acid or Base?
(3) Although anhydrous aluminium chloride is covalent but its aqueous solution is ionic in nature. Why?
(4) Why BF3 do not exist as dimer?. Explain.
(5) Why B-F bond length in BF3 is shorter (130 pm) than B-F bond Iength in BF4- (143 pm)?. Explain.
(6) B-F bond length in BF3 is shorter than B-F bond length in (BF4)- why?
(8) What is product of reaction between diborane (B2H6) and ammmonia (NH3)?
(9) Why methylation of Diborane (B2H6) replace four hydrogen only ?
(10) What is Use of Boric Acid?
(11) What is use of Orthoboric acids?
(12) What is basicity of "Boric acid" ?
(13) Why Boric acid exist in solid state ?
(14) What is structure of solid Ortho Boric acid ?
(15) What is effect of heat on Borax?
(16) What is the structure of trimetaboric acid and trimetaborate ion?
(17) What is the Sodium per borate ,give the structure and its uses?
(18) Why aqueous solution of borax reacts with two moles of acids ?
(19) What is the molecular formula of Borax ?
(20) Why Boric acid become strong acid in the presence of cis 1,2-diol or 1,3-diol ?
(21) Why Borazine is more reactive than benzene towards Electrophic Aromatic substitution reactions ?
(22) Why Borazine (B3N3H6) is also known as inorganic benzene ?.
Tuesday, January 19, 2021
The type of overlap in the bridge bond exist in Al2(CH3)6 is
(A) sp3-sp3d-sp3
(B) sp3-sp2-sp3
(C) sp3-s-sp3
(D) sp3-sp3-sp3
Solution: Structure of Al2(CH3)6:
Answer Key (D)
Related Questions:
(1) What is structure of diborane?
(2) What is structure of Al(CH3)3 and also explain the bridge bonding in Al(CH3)3?
(3) What is bridge bond ? explaine 3C-4e bridge bond with suitable examples .
(4) What is structural feature of monomeric and polymeric Beryllium halides ?
(5) What is the difference between the structure of AlCl3 and diborane?
(6) What is structure of Beryllium chloride ?
(7) What is structure of BeH2 in solid state ?
Which of the molecule have strongest P=O bond present the given molecules are POF3, POCl3, POBr3 and PO(CH3)3 ?
All the given molecules have same hybridization (sp3) and same central atom (P) the we can apply Bent's rule of hybridization. And according to Bent’s rule more electronegative atoms attach in those hybrid orbital’s which have less s-character or more electronegative atoms decreases s-character and increases p-character.
In
case of POF3 fluorine is more
electronegative hence s-character is
increase more and more in P=O bond as
compare to other given molecules so P=O bond is shortest in POF3 than others and also increase with decreasing
electronegativity. Hence P=O bond length
order is x1 < x2 < x3
< x4 and Bond strength order is reverse of bond length.
Related Questions:
What is Bent’s
rule of hybridization?
Which of the
following compound have longest (S=O)bond length , O=SF2, O=SCl2, O=SBr2.
Why Bond length
of O-O is greater in H2O2 than O2F2?
How to arrange
increasing (C-H) bond length in increasing order and H-C-F bond angle in the
given compounds, CH4, CH3F, CH2F2 and CHF3 ?
Dipole moment of
PCl3F2 molecule is zero while dipole moment of PCl2F3 molecule is non zero why?
Dipole moment of
P(CH3)2(CF3)2 molecule is zero while dipole moment of P(CH3)2(CF)3 molecule is
non zero why?
How to compare
equatorial bond angle (F-S-F) and S-F bond length of SOF4 and SF4 molecules ?
How to compare
P=O bond length of POF3, POCl3, POBr3 and PO(CH3)3 molecules?
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