Select the most appropriate 'one word' for the expression given below.

One who has persistent neurotic impulse to steal

Kleptomaniac

The most appropriate one-word substitution for the expression "one who has persistent neurotic impulse to steal" is kleptomaniac.

• Connoisseur means an expert in a particular field, especially one who appreciates fine art, food, or wine.
• Hypocrite means a person who pretends to have beliefs or feelings that they do not actually hold.
• Iconoclast means a person who attacks established beliefs or institutions.

Of these words, only kleptomaniac specifically refers to a person who has an uncontrollable urge to steal. This is a mental health condition that is characterized by a repeated inability to resist the temptation to steal, even when there is no need or desire for the stolen items.