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There are a total of 180 questions asked in the exam, 45 questions each from Physics, Chemistry, Botany and Zoology. Each correct response fetches 4 marks and each incorrect response gets -1 negative marking. The exam duration is 3 hours (180 min). The exam is of 720 marks (maximum marks).
On 5 May 2024, the day of the NEET-UG examination, several social media posts alleged that the exam questions had been leaked in advance. [4] The NTA denied these allegations but issued a public notice stating that an incorrect distribution of papers had occurred at the Girls Higher Secondary Model Vidya Mandir examination center in Sawai Madhopur, Rajasthan. [5]
JEE-Main, unlike JEE-Advanced, has a fixed exam structure and is not subject to change every year. Up until 2018, the JEE-Main Paper-I was three hours long and consisted of thirty questions in each of the three subjects (physics, chemistry and maths). 4 marks are awarded for correct answers and 1 mark is deducted for incorrect answers.
Which "classic organic chemistry" reactions admit chiral catalysts? Is it possible to construct a quaternary carbon atom with arbitrary (distinguishable) substituents and stereochemistry? Can artificial enzymes replace the need for protecting groups when modifying sensitive compounds? [8]
The question papers are distributed by the overseeing board of education, and their contents are guarded closely until the exam begins. The examinations may include multiple sets of question papers as well. The candidates are issued identification passes in advance, which are presented to the staff at the examination site.
The AIEEE was introduced in 2002, since the newly established NITs, IIITs and GFTIs wanted an entrance examination paper of a higher standard than the Common Engineering Test (CET), which was formerly used for admission to all non-IIT engineering colleges and some state government colleges also in few states, including even RECs and IIITs, owing mostly to the rising competition and the goal of ...
In organic chemistry, neighbouring group participation (NGP, also known as anchimeric assistance) has been defined by the International Union of Pure and Applied Chemistry (IUPAC) as the interaction of a reaction centre with a lone pair of electrons in an atom or the electrons present in a sigma or pi bond contained within the parent molecule but not conjugated with the reaction centre.
The notion of precipitation can also be extended to other domains of chemistry (organic chemistry and biochemistry) and even be applied to the solid phases (e.g. metallurgy and alloys) when solid impurities segregate from a solid phase.