Chemistry

Also known as arenes, they are a special category of hydrocarbons that have a ring-like structure. These hydrocarbons consist of delocalized pie electrons and are known to be very stable. Benzene is known to be the simplest aromatic hydrocarbon 

Paraffin is a term derived from the latin literature meaning low reactivity or little affinity. This term is generally used to denote alkanes because out of all the hydrocarbons, they have the least reactivity because of having a strong carbon bond between their atoms.

In the medical entrance test NEET, there can be 1 to 3 questions from this chapter. Some year, the Chemistry section of NEET has only one question from this chapter and in some other years, there can be 3 questions.

The following are the key concepts of this chapter: Compound, Elements, Rules, Law of conservation of mass, Addition and Subtraction, Atomic Mass, Law of multiple proportions, and Molecular Mass.

As the name suggests, the first chapter of the NCERT Class 11 Chemistry introduces various basic concepts of chemistry, such as the definition and importance of chemistry, atomic matter and molecular masses, the mole concept, laws of chemical combination, empirical, stoichiometry, and molecular formulas. It also includes the concepts of molarity and molality.

Higher is the stability of carbocation, greater is the reactivity towards SN1.

Therefore, Correct order of reactivity towards SN1 reaction is

Ranitidine, cimetidine and magnesium hydroxide are antacids.

Serotonin is a tranquilizers.

Correct order of reducing character is

NH₃< PH₃< AsH₃< SbH₃< BiH₃