Answer:
The
hydrocarbon having molecular mass of 72 g 
must
be 
Since on photochlorination, it
gives a single monochloro derivative, therefore, all the twelve hydrogens in
this hydrocarbon are equivalent.
Thus, the hydrocarbon must be neopentane or 2,2-dimethylpropane. It forms
only one monochloro derivative and two dichloro derivatives as shown below :
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