Why does an iron needle float on clean water but sink when some detergent is added to this water?

Surface tension is the property of a liquid by virtue of which the free space of the liquid at rest tends to have minimum area and as such it behaves as if covered with a stretched membrane. It is measured as the force acting an unit length of a line imagined to be drawn tangentially anywhere on the free surface of liquid at rest. It acts at right angles to this line on both sides and along the tangent to the liquid surface. The iron needle will floats on clean water but sink when some detergent is added to this water (a) True (b) False

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If you mix oil in the water then oil keeps floating on water but in detergent water it gets mixed this is because

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