Intake of which of the following can be lethal? 

Absolute alcohol 

The correct answer is option 2. Absolute alcohol.

The intake of absolute alcohol can be lethal. Absolute alcohol, also known as pure ethanol, is a highly concentrated form of alcohol that is typically used in laboratories and industrial processes. Consuming even small amounts of absolute alcohol can lead to alcohol poisoning, which can be fatal. Therefore, among the options provided, absolute alcohol is the substance that can be lethal when ingested.