Which of the following substances act as a fluorinating agent?

The reaction of the type $2X_2 + S \to SX_4$ is shown by sulphur when $X$ is

Identify the correct decreasing order of bond dissociation enthalpy from the following.

Which of the following pairs is not correctly matched?

When a mixture of solid $NaCl$ and solid $K_2Cr_2O_7$ is heated with concentrated $H_2SO_4$,orange-red vapours are obtained of the compound:

Which of the following is incorrectly matched?