The grammatically incorrect form is: 'Scarcely he had finished his speech when the audience applauded.'
Q1. The grammatically incorrect form is: 'Scarcely he had finished his speech when the audience applauded.'
Answer: Scarcely he had finished his speech when the audience applauded.
Explanation: Option A lacks inversion after 'Scarcely'. The correct form is 'Scarcely had he'.