Hello,
From the given options the correct option is option (d) 2-methyl-propane.
Since we want only two monochloro derivatives sand that too isomeric so if we consider the structure of 2- methyl-propane then there are only two positions possible that are different.
The two isomers will be - I) 1-Chloro-2-methyl-propane and II) 2-choro-2-methyl-propane.
I hope you find the answer helpful
Thank you.
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