The given alkane 2,2,5,5- tetramethylhexane has two types hydrogen, hence, it forms two different structural isomers on chlorination.

Total numbers of isomers are equal to three as second molecule is optically active.
Maximum number of isomeric monochloro derivatives which can be obtained from 2,2,5,5- tetramethylhexane by chlorination is _________
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