Identify which is the wrong pair of conjunction

The correct answer is Option 4). 'Hardly...when' is the correct pair of conjunction

• Correlative conjunctions work in pairs to join words or phrases that have equal importance within a sentence.
  ​List of correlative conjunctions: either/or, both/and, whether/or, neither/nor, not only/but also, not/but, as/as, such/that, scarcely/when, as many/as, no sooner/than, rather/ than, hardly/when