Which of the following species contains an equal number of σ and Π bond?
HCO3-
XeO4
(CN)2
(CN)2
B.
XeO4
Structure |
σ and Π |
|
σ bond -4 |
|
σ bond -4 |
|
σ bond -3 |
|
σ bond -6 |
Consider the molecules CH4, NH3 and H2O. Which of the given statement is false?
The H-O-H bond angle in H2O is larger than the H-C-H bond angle in CH4.
The H-O-H bond angle in H2O is smaller than the H-N-H bond angle in NH3.
The H-C-H bond angle in CH4 is larger than the H-N-H bond angle in NH3
The H-C-H bond angle in CH4 is larger than the H-N-H bond angle in NH3
A.
The H-O-H bond angle in H2O is larger than the H-C-H bond angle in CH4.
According to VBT: lone pair-lone pair repulsion is more than a bond pair -lone pair repulsion.
As the number of lone pair of electrons on central element increases, repulsion between that lone pair of electrons increases and therefore, bond angle decreases.
Molecules |
Bond angle |
CH4 (no lone pair of electrons) |
1090.5 |
NH3(one lone pair of electrons) |
107.50 |
H2O (two lone pair of electrons) |
104.450 |
Predict the correct order among the following.
long pair-lone pair> bond pair-bond pair> lone pair>bond pair
bond pair-bond pair> lone pair-bond pair > lone pair -lone pair
lone pair -bond pair > bond pair- bond pair> lone pair -lone pair
lone pair -bond pair > bond pair- bond pair> lone pair -lone pair
D.
lone pair -bond pair > bond pair- bond pair> lone pair -lone pair
According to the VSPER theory, a lone pair occupies more space than a bond pair, Hence when lone pair-lone pair interacts with each other they repel more and thus the correct order is:
lone pair - lone pair > lone pair-bond pair > bond pair -bond pair.
The pair of an electron in the given carbanion, is present in which orbital?
sp3
sp2
sp
sp
C.
sp
Consider the following compounds
Hyperconjugation occurs in
I only
II only
III only
III only
C.
III only
Hyperconjugation occurs through the H- atoms present on the carbon atom next to the double bond i.e alpha hydrogen atoms. There is no alpha -H in the structure I and II.
So, hyperconjugation occurs in structure III only ie.