Identify a species which is not a Bronsted acid but a Lewis acid
BF3
HO
NH3
HCl
A.
BF3
Bronsted defined an acid as a substance, which has a tendency to give a proton (H+), on the other hand, Lewis proposed an acid as a substance, which is capable of accepting a pair of electrons As H3O+, NH3, and HCl has H+ ions, these are Bronsted acids whereas BF3 is an electron deficiet molecule, thus be have like a Lewis acid, i.e, electron pair acceptor.
d2sp3 hybridisation of the atomic orbitals gives
square planar structure
triangular structure
tetrahedral structure
octahedral structure
A group of atoms can function as a ligand only when
It is a small molecule
It has an unshared electron pair
Its a negatively charged ion
It is a positively charge ion
The process is spontaneous at the given temperature, if
ΔH is +ve and ΔS is -ve
ΔH is -ve and ΔS is +ve
ΔH is +ve and ΔS is +ve
ΔH is +ve and ΔS is equal to zero.
Mesomeric effect involves
delocalisation of π- electron
delocalisation of σ- electron
partial displacement of electrons
delocalisation of π and σ- electron
Alkali metals have negative reduction potential and hence they behave as
oxidising agents
Lewis bases
reducing agents
electrolytes
Cycloalkane formed when 1,4-dibromopentaneis heated with sodium is
methyl cyclobutane
cyclopentane
cyclobutane
methyl cyclopentane