Hello,

The criteria is not fixed, however, organic chemistry being a simple and low calculation topic, direct question such as naming of reactions, preparation, IUPAC nomenclature, tests, etc. are asked. Around 40% of chemistry is organic chemistry. There is no fixed topic wise marks, it happens that 2-3 questions are asked from IUPAC nomenclature, whereas none from ethers and acids.

In general Alkyl halides, Ketones, Carboxylic acids and ethers are important topics.

For topic wise marks weightage in JEE main 2020, please refer the below mentioned article:

https://engineering.careers360.com/articles/jee-main-syllabus-weightage

Hope this Helps