Assertion : F-F bond has low bond dissociation
Reason : The fluorine has lower reactivity.

Options

A. If both the assertion and reason are true and reason is correct explanation of the assertion .
B. If both the assertion and reason are true but reason is not a correct explanation of the assertion .
C. If the assertion is true but the reason is false.
D. If both assertion and reason are false.

Answer

C

Explanation

Lower value of bod bond dissociaton energy of fluorine is due to the high inter electronic repulsions between non-bonding electron of the 2p-orbital of small sized fluorine . As a result F-F bond is weaker as comparison to Cl-Cl and Br-Br bonds .
Bond dissociation energy
`{:("F-F 38 K cal / mole "),(Cl-Cl" 57K cal/mole"),(Br-Br" 45.5 K cal/mole"),(I-I" 35.6 K cal/mole"):}`