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Step 1: Nitration of benzene Benzene + conc. H₂SO₄ + conc. HNO₃ with heat & under reflux --> Nitrobenzene Step 2: Reduction of nitrobenzene Nitrobenzene + tin + con...

The vaccine contains antigens of the virus. When injected, these antigens are recognised by macrophages which engulf the antigen and present the antigens on their surface. Once the antigens are presented,...

The Bei sentence can be used to express passive voice. The structure is subject + 被 + object + verb + other elements. The subject is the patient of the action, and the object is the agent. If there are an...