Identify the reaction condition

Benzene reacts with chlorine in sunlight.

• In presence of a Lewis acid like $FeCl_3$, benzene undergoes electrophilic substitution to give chlorobenzene.
• But in sunlight ($h\nu$), benzene undergoes addition with chlorine.

Write the reaction

$C_6H_6 + 3Cl_2 \xrightarrow{h\nu} C_6H_6Cl_6$

The product is benzene hexachloride (BHC), also called hexachlorocyclohexane.

Count the number of hydrogen atoms in product $X$

Product $X$ has molecular formula:

$C_6H_6Cl_6$

Therefore, the number of hydrogen atoms in $X$ is:

$6$

Compare with stored correct answer

• Derived answer: $6$
• Stored correct answer: $6$

Both match.