The topic of aromatic compound comes under the chapter of hydrocarbon. This chapter is covered in ncert class 11^thand 12^thchemistry book. Students appearing for competitive exams like JEE OR NEET or any other state exams are advised to finish the first reading of the chapter, thoroughly from the textbook and then switch to the prescribed books for in depth study from their respective competitive exams point of view. Also, the textbook questions should be solved properly. In this way students will be able to build a clear fundamental concept which will further simplify or make it easier to grasp interlinked topics.

Organic compounds can be classified into two types, acyclic and cyclic. Acyclic are the ones that have open chain of carbon atoms while cyclic compounds are the ones that have close chain of carbon atoms. It is often observed that students define aromatic compounds as cyclical structure that contains at least one benzene ring. This statement may not be entirely correct. The simplest way to define aromatic compound is a chemical compound (mostly organic) which containing one or more rings with pi electrons delocalized around it. These have relatively stable bonding and are resistant to many reactions. It is less dense than water at 20 degrees centigrade and is not soluble in water. It is however soluble in organic solutions such as hexane and carbon tetrachloride. It has a pleasant fragrance, but it should be noted that aromatic compounds cannot be identified based on their odor. So how exactly can it be identified? To be classified as aromatic organic compound following criterion must be met. First, it should have planar geometry. Secondly it should be cyclic in nature. Third criterion is there should be in continuous conjugation and lastly it should have (4n+2) electrons. This is called huckle’s rule.

Now what does it mean to fulfill the criteria of cyclic compound being planar geometry in nature? The aromatic compound should be planar in nature implies p-orbitals are more or less parallel and interact with each other. The cyclic organic compound is planar in nature when all the carbon atoms present in the ring are sp2 hybridized and they lie in the same plane.

What is hybridization? Hybridization can be defined as mixing of the atomic orbitals belonging to the same atom. Since the energies are slightly different the redistribution of energies takes place which results in formation of new orbitals having equal energies and identical shapes. This results in formation of new orbitals are called as hybrid orbitals.

Now what is sp2 hybridization? Mixing of one ‘s’ orbital and two ‘p’ orbital of equal energy results in the formation of new hybrid orbital known as sp². This process is called as Sp2 hybridization. This mixture formed of s and p orbital is maintained at 120⁰and is trigonal in symmetry. Thus, this is also called as a trigonal hybridization

We also need to understand what is localized and non-localized pi bonds. Now the pi bonds are between two unhybridized p orbitals that are adjacent to each other (from hybridization model). These p orbitalsaligned with respect to each other will overlap. To understand this more consider you have these unhybridized orbitals in more than 2 adjacent atoms. All of these unhybridized p orbitals which are next to each other will overlap. The electrons within these p orbitals will be delocalized as they can extend out to more than 2 atoms rather than being localized to 2 atoms from 2 p orbitals that are overlapping with each other. Example for this is benzene.

There are many uses of aromatic compounds in everyday life. They are used as solvents for fats, rubber etc. They are used in preparation of pesticides, dry cleaning of woolen clothes. These are also the raw materials for preparation of several drugs, perfumes, explosives. Petroleum and coal tar contain many aromatic hydrocarbons. The parent compound benzene was first obtained from the gas obtained by pyrolysis of whale oil by Faraday.

This is the basic idea regarding aromatic compounds. Students must study the principal reaction of benzene. It a can be studied under the following category of reaction namely oxidation, reduction, addition and substitution reactions.

Learn how to solve tricky question:

What is the correct order of o//p ration when E^(+) attacks the following system?

(A) PhF (B) PhCl (C) PhBr(D) PhI

1. A) A<B<C<D
2. B) A=B=C=D
3. C) D<C<B<A
4. D) D<B<A<C

Attempting the GMAT exam is no easy task, it requires several hours of preparation. Besides, it is also an expensive affair as it costs US $250 or 18300 INR approximately. It is therefore absolutely crucial that you are well-prepared for the exam to reach your desired target score in your first attempt itself. Otherwise, you will have to pay the GMAT exam fees every time you wish to attempt the exam. Moreover, besides the GMAT exam registration fees you will also have to pay a prescribed fee for other services which GMAC provides. We have listed them below in the following table for your reference. So, read on!

Fees for GMAT Services: 

As you can infer from the above table, the GMAT registration fees will cost you a substantial amount. Therefore,  as already mentioned, the GMAT exam cost is expensive and you must be thorough with your preparation. To ensure that your GMAT preparation is on track, you must have a good study plan that covers all the topics of the GMAT syllabus. Let us learn more about the syllabus of the exam.

GMAT Syllabus 

The GMAT exam has four sections — Integrated Reasoning, Verbal Reasoning, Quantitative Reasoning and Analytical Writing Assessment. The questions from these sections are designed to assess your logical reasoning, analytical writing, critical thinking and problem solving skills..

We have listed below the types of questions that you will come across in each section of the GMAT exam:

You must be well versed with all the above types of questions so that you are able to achieve your targeted GMAT score. For this you must first map out a detailed study plan. Doing so will help you track the progress of your preparation for the GMAT exam. Besides, make sure your study plan covers all the topics of all the sections. To get a comprehensive list of the topics, you can download the GMAT syllabus pdf from authentic sources like the GMAC. If you are familiar with the GMAT syllabus you will be able to judge how much you need to study, which topics you need to spend more time on and how much time is required to complete studying all of the topics.

We have listed down some of the important topics of the syllabus from each section below : 

Verbal Reasoning 

Verbal Reasoning assesses your ability to read and comprehend the passage given, reason and evaluate the arguments that are presented and review incorrect sentences and phrase them properly. 

• Phrases and clauses
• Pronoun agreement
• Subject Verb agreement
• Verb tense
• Modifiers
• Parallelism
• Parts of speech
• Active to passive
• Direct and indirect
• Idioms & idiomatic expressions
• Basic sentence structure: adjectives, pronouns, nouns
• Articles

Quantitative Reasoning

Quantitative Reasoning assesses your proficiency in basic high school level math concepts. It also evaluates your skills in interpreting data given in graphical format and your abilities in solving quantitative problems.

• Multiples and factors
• Averages
• Fractions
• Inequalities and basic statistics
• Probability
• Profit and loss
• Percentages
• Decimals
• Arithmetic and geometric progression
• Speed, time, and distance
• Exponents
• Mixtures and allegations
• Coordinate geometry
• Lines and angles
• Quadratic equations
• Circles
• Powers and roots
• Sets
• Quadrilaterals
• Triangles
• Simple and compound interest
• Rectangular solids and cylinders
• Number systems and number theory
• Permutations and combinations
• Monomials, polynomials
• Sequences and series
• Pipes, cisterns, and work time
• Ratio and proportion
• Algebraic expressions and equations
• Descriptive statistics
• Functions
• Quadratic equations

Analytical Writing Assessment

There’s one essay type question in the analytical writing assessment section — “Analyse an Argument”. You have to analyse and write a critique of the given argument.  The objective is to check how clearly you are able to express and put forth your ideas. It evaluates how well you are able to organise your opinions, provide supporting evidence and examples to support your thoughts. Another important parameter that is measured is how well you can write grammatically and logically correct sentences. 

Integrated Reasoning 

The questions asked in this section are in the form of, passages, graphs,  tables or a combination of all three. It is to basically evaluate how well you are able to interpret visual data and gather relevant information from it to answer the questions  that follow. 

We hope this article has given you a brief overview of the syllabus of the different sections in the GMAT exam, the skills which are tested on, and the types of questions which you will come across in all four sections. In addition to the above, we hope that now you are aware of the GMAT registration fee as well as and the cost of the different services provided by GMAC.

Many people dream of careers within the dynamic aviation trade, and with smart reasons to take many aviation online courses. Not solely will a high-flying career promise journey and excitement, however, jobs in aviation still accompany different edges, as well as everything from flexibility to job security.

Aerospace engineers style primarily craft, spacecraft, satellites, and missiles. In addition, they produce and check prototypes to create positives that operate consistent with the style. Region engineers are used in several sectors, as well as region product and elements manufacturing; engineering services; the federal government; steering, measuring, electromedical, and management instruments manufacturing; and analysis and development within the physical, engineering, and life sciences. Specifically, region engineers are operating to style a lot of environmentally friendly craft that turns out less pollution with increased fuel potency. Area exploration is additionally a rising space of interest for several regional engineering corporations. Proper training in the field will do the trick and it should be known that there are different aviation online courses to choose from for better efficiency in the field.

The industrial aviation sector of aviation involves operating craft for rent to move passengers or multiple countless payloads. If there’s cash involved to fund the flight, it’s thought-about an advertisement operation! Therefore, industrial aviation covers airline operations. To boot, payload freight transportation by air is taken into account by industrial aviation. completely different certifications conjointly represent the structure of the airline trade. Within the U.S. and different elements of the planet, regular airlines are classified to support the quantity of revenue generated by operations.

Aircraft and astronautics instrumentation mechanics and technicians repair and perform upkeep on craft. they’re answerable for a broad vary of duties, as well as diagnosis mechanical and electrical problems; repairing wings, brakes, electrical systems, and different craft components; replacement defective elements by hand or with power tools; examining replacement craft elements for defects; reading maintenance manuals to spot repair procedures; testing craft elements with gauges and different diagnostic tools; inspecting completed work, and maintaining records. 

Agricultural aviation is an agricultural tool used to plant fields, manage herds of livestock, and treat crops. In fact, consistent with AOPA, agricultural aviation plants ninety-five p.c of rice and treats seventy-five million acres of crops within u.  s. once a year.

Military aviation is the use of military craft and different flying machines to conduct or modify aerial warfare. This includes air payload which will give logistic supplies to stationed troopers. You can also learn to be a military aviation officer by taking some aviation online courses.

General Aviation

According to the Aircraft Owners and Pilots Association (AOPA), a calculable sixty-fifth general aviation flight is conducted for business and public services that require transportation a lot of versatility the airlines can give. A general aviation craft is for private transport or business transport that doesn’t use an airline.