Correct Answer: Option D

Explanation

 The longest carbon chain containing the principal functional group (the hydroxyl group, -OH) has three carbon atoms, giving the parent name propanol.

The chain is numbered starting from the end closest to the principal functional group (-OH) to give it the lowest possible locant. Therefore, the carbon attached to the -OH group is C1. With the -OH group at position 1, the chlorine atom (-Cl) is attached to the second carbon atom (C2). 

Combining the substituent (2-chloro) with the parent chain (propan-1-ol) results in 2-chloropropan-1-ol.

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