The number of chlorine atoms present in the organic products X and Y of the following reactions, respectively are : [figure]
- 3 and 3
- 6 and 6
- 6 and 3
- 3 and 6
Answer
(2) 6 and 6
Solution
With excess Cl2 in presence of anhydrous AlCl3 in dark (cold), electrophilic substitution of all six H atoms takes place:
X = hexachlorobenzene, C6Cl6 ⇒ 6 Cl atoms
As per NCERT, under UV light (500 K) three molecules of Cl2 add to benzene:
Y = benzene hexachloride (BHC), C6H6Cl6 ⇒ 6 Cl atoms
∴ 6 and 6
Answer: (2)