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- Engineering
- Solve it, - p- Block Elements - JEE Main
The bond dissociation energy of in
is 646 kJ mol -1 whereas that of
in
is 515 kJ mol -1 The correct reason for higher
bond dissociation energy as compared to that of
is
- Option 1)
smaller size of
as compared to that of
- Option 2)
stronger
bond between
in
as compared to that between
in
- Option 3)
significant
interaction between
- Option 4)
lower degree of
Answers (1)
As we learnt in
Atomic radius of boron family -
Increases down the group except aluminium
- wherein
Abrupt increase in Al radius is due to greater screening effect of Al than in B
B has vacant p orbitals and so it involves back bonding which is not possible in CF4 as C does not have any vacant orbital.
Therefore, B - F bond is stronger than C - F bond.
Option 1)
smaller size of as compared to that of
This option is incorrect.
Option 2)
stronger bond between
in
as compared to that between
in
This option is incorrect.
Option 3)
significant interaction between
in
whereas there is no possibility of such interaction between
in
This option is correct.
Option 4)
lower degree of interaction between
in
then that between
in
This option is incorrect.
JEE Main high-scoring chapters and topics
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