Question

The set of compounds in which the reactivity of halogen atom in ascending order is:
A). Vinyl chloride, chloroethane, chlorobenzene
B). Vinyl chloride, chlorobenzene , chloroethane
C). chloroethane, chlorobenzene, Vinyl chloride
D). chlorobenzene, Vinyl chloride, chloroethane

Answer 1

The great reactivity of fluorine largely stems from the relatively low dissociation energy, a standard measure for bond energies, of the bond (37.7 kilocalories per mole) and its ability to form stable strong bonds with essentially all the other elements.

Complete step by step answer:
The reactivity of the halogen atom in ascending order is in the following set:
chlorobenzene < vinyl chloride < chloroethane.
This is because of the fact that in chlorobenzene and vinyl chloride, the $Cl - Cl$ bond acquires some double-bond character due to resonance. A set of compounds in which the reactivity of a halogen atom is in the ascending order, is: Answer. Chlorobenzene, vinyl chloride, chloroethane.

So, the correct answer is Option D.

Additional Information:
Vinyl chloride finds its major application in the production of PVC. It is volatile, so the primary exposure is via inhalation as against food or water with occupational hazards being highest. Prior to 1974, workers were commonly exposed to 1,000 ppm vinyl chloride, causing "vinyl chloride illness" such as acroosteolysis and Raynaud's Phenomenon.

Note: The symptoms of vinyl chloride exposure are classified by $ppm{\text{ }}levels$ in ambient air with $4,000\;ppm\;$ having a threshold effect. The intensity of symptoms varies from acute $\left( {1,000 - 8,000{\text{ }}ppm} \right),$ including dizziness, nausea, visual disturbances, headache, and ataxia, to chronic $\left( {above{\text{ }}12,000{\text{ }}ppm} \right)$ , including narcotic effect, cardiac arrhythmias, and fatal respiratory failure. RADS (Reactive Airway Dysfunction Syndrome) may be caused by acute exposure to vinyl chloride.