Chemical Bonding
How many of the following statements are correct?
1) has a trigonal pyramidal structure with P-F bond longer than P-Cl bond
2) In , energy required to replace hydrogen atom from bridged position is more than that required for replacing hydrogen atom from terminal position.
3)Because of high electronegativity of halogen atoms, the stability of the following carbenes is :
4)As per MO theory, in carbon monoxide(CO) , the orbitals of carbon and oxygen combine to form new sets of molecular orbitals , thus all electrons occupy either bonding /anti-bonding molecular orbitals and electron filling takes place as per Hund's rule and Pauli's exclusion principle.
5)Hybridisation of central atom in is , with structure distorted because of presence of lone pair..
6)As %s character increases,an orbital becomes more bulkier and shorter
7)Bent's rule can be explained on the fact that the order of proximity of orbitals (of same principle quantum number) is s> p> d> f
8) has pentagonal bipyrimidal geometry, with lone pair occupying equatorial position.Because of this asymmetry, dipole moment is non zero .
9)Electron gain enthalpy is negative for all elements , the only exception being Nitrogen and inert gases
10)Energy of hybrid orbitals of simple molecules like can be found experimentally, atleast an average value.
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1 solution
The correct statements are 2 , 6 , 7.
1) Axial orbital length is greater in s p 3 d hybridisation, but that does not imply that bond length is also greater. Bond length also depends on size of the other atom!
2) True
3) There is back bonding in case of : C C l 2 , : C F 2 , which make them more stable than : C H 2
4)Electrons occupy bonding , anti-bonding and non-bonding orbital of C atom
5) Concept of Hybridisation is not applicable for these molecules, as percentage of p character in Y-H bond (Y = A s , P , S b ) is much much greater than s character.
6)True
7) True . Electronegative atom prefers to pull electrons towards itself and this is easier with orbital of minimum s character
8) X e F 6 has zero dipole moment. It consists of three structures in equilibrium with each other .
9)Even alkaline earth metals have positive Electron gain enthalpy.
10) Concept of Hybridisation is theoretical . U can only approximate energy of hybrid orbitals theoretically.