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The number of monochloro derivatives formed by the action of chlorine on isopentane is 5.

The 5 monochloro derivatives are as follows

1 . CH3-CH2-C-Cl CH3-CH3

2.CH3-CHCl-CH-CH3-CH3

3.CH2Cl-CH2-CH-CH3-CH3

4.CH3-CH2-CH-CH2Cl-CH3

5.CH3-CH2-CH-CH3-CH2Cl

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