Back Bonding

Which of the following statement (s) is/are correct? (a)In BF_3 , there is pπ-pπ back bonding B and F. (b)In BI_3 , there is pπ-pπ back bonding B and I (c) pπ-pπ back bonding makes BI_3 least acidic among boron trihalides. (d) BI_3 is strongest Lewis acid among all the boron trihalides.

The small size and high charge of Al^(3+) ion gives it a high charge density which is responsible for its tendency to show (a) covalency in its compounds in the gaseous state (b) high hydration energy which stabilizes its compounds in solution, and (c) high lattice energy of its compounds in the solid state. Thus aluminium can forms both covalent and ionic bond. Like halides of boron, halides of aluminium do not show back bonding because of increase in size of aluminium. Actually aluminium atoms complete their octets by forming dimers. Thus chloride and bromide of aluminium exist as dimers, both in the vapour state and in polar-solvents like benzene while the corresponding boron halides exists as monomer. In boron trihalides the extent of back bonding decreases with increases with increase in size of halogens and thus lewis acid character increases. All BX_(3) are hydrolysed by water but BF_(3) shows a different behaviour. Which of the following reaction is incorrect ?

The number of oxygen atoms in borax which do not from ppi-ppi back bond is:

Find the number of chemical species, in which 2 p pi -3 d pi back bond is present B(OH)_(3), N(SiH_(3))_(3),P(CH_(3))_(3),N(GeH_(3))_(3),BeCl_(2),O(SiH_(3))_(2),O Cl_(2),BCl_(3)

What is the meant by the term 'chemical bond' and 'chemical bonding'.

The molecule in which an atom is associated with more than 8 electrons is known as hypervalent molecule and less than 8 electrons is known as hypovalent molecule. All hypervalent molecules must have ppi-dpi bonding but the molecules having back bonding back boding need not to have always ppi-dpi bondin. Q.Which of the following molecule is not having ppi-dpi bonding:

The molecule in which an atom is associated with more than 8 electrons is known as hypervalent molecule and less than 8 electrons is known as hypovalent molecule. All hypervalent molecules must have ppi-dpi bonding but the molecules having back bonding back boding need not to have always ppi-dpi bondin. Q.Which of the molecule is not hypovalent but complete its octet:

The molecule in which an atom is associated with more than 8 electrons is known as hypervalent molecule and less than 8 electrons is known as hypovalent molecule. All hypervalent molecules must have ppi-dpi bonding but the molecules having back bonding back boding need not to have always ppi-dpi bondin. Q. Which of the following is having complete octet:

Back cross is

What are back ground radiations?