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Hydrocarbons
Introduction:
A hydrocarbon is a compound consisting entirely of Hydrogen and Carbon . Hydrocarbons from which one Hydrogen atom is removed are called Hydrocarbyl . They occur beneath the surface of earth in crude oil . Nomenclature, isomerism, conforn1ations ( ethane only), physical properties, chemical reactions including free radical mechanism of halogenation, combustion and pyrolysis are discussed .Structure of double bond (ethene), geometrical isomerism, methods of preparation: chemical reactions: addition of hydrogen, halogen water, hydrogen halides (Markovnikov's addition and peroxide effect), ozonolysis, oxidation, mechanism of electrophilic Addition are included along with. e, structure of triple bond (ethyne) acidic character of alkynes, addition reaction of hydrogen, halogens, hydrogen halides and water. Aromatic hydrocarbons- Introduction, IUPAC nomenclature; Benzene; resonance, aromaticity; chemical properties: mechanism of electrophilic substitution- Nitration, sulphonation, halogenation, Friedel Crafts alkylation and acylation; directive influence of functional group in mono-substituted benzene; carcinogenicity and toxicity.
Chapter Analysis:
This chapter was asked extensively in the past but slowly lost its questions in the paper . A recent analysis of paper shows it has been constant since 2014 to 2017 with 1 quesstion each year and then 2 each in the previous two years . On the contrary before 2014 y before 2014 15 questions were asked in the previous 5 preceding years . It has become a low weighted chapter now and you can expect 1 to 2 questions from this chapter . The below given bar-graph illustrates the frequency of questions appearing in paper from this chapter :
| Year | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Questions | 2 | 2 | 1 | 1 | 1 | 1 | 4 | 4 | 3 | 2 | 2 |
The important topics to be covered: • Properties of alkanes , alkenes and alkynes • Isomerism and nomenclature • Resonance
Q. How many Marks in Hydrocarbons ask in NEET every year?
Till 2013 on avg 4 questions were asked every year. But since 2014 1 or 2 questions are been asked every year.
Q. Can we skip Hydrocarbons in NEET preparation?
Hydrocarbons is important since the future topic are dependent on it so skipping this topic would not allow you to understand remaining topics. So no you cannot skip Hydrocarbons at all