ORGANIC CHEMISTRY

                               ORGANIC CHEMISTRY

ORGANIC CHEMISTRY IS THAT IN WHICH WE GENERALLY HAVE A DOUBT . IN THIS PARTICULAR BLOG NOW DISCUSS SOME THINGS RELATED TO ORGANIC CHEMISTRY , 

DON'T WORRY I WILL GIVE YOU THE PDF ALSO ..SO LET'S BEGIN  :-)

QUES - Who should Practice these Organic Chemistry Questions?

-- Anyone who prepare for IIT JEE ,ENGINEERING  ENTRANCE EXAMS, NEET ETC– Anyone wishing to sharpen their knowledge of Organic Chemistry Subject.
– Anyone preparing for aptitude test in Organic Chemistry.
– Anyone preparing for interviews (campus/off-campus interviews, walk-in interview and company interviews).
– Anyone preparing for entrance examinations and other competitive examinations.
– All – Experienced, Freshers and Students.

                                                ISOMERISM

This set of Organic Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Isomerism”.

1. Choose the incorrect option regarding Isomerism:
a) They differ in both physical and chemical properties
b) They have the different molecular formula
c) There are two types of Isomerism : Structural and Stereo Isomerism
d) Geometric and optical isomerism are two types of Stereo Isomerism

2. Which among the following is formed when an alcohol is dehydrated?
a) alkane
b) alkyne
c) alkene

d) aldehyde                                                                                                   

3. A fat on hydrolysis would yield?
a) Glycerol and soap
b) Ethanol and soap
c) Ethanol and glycerol
d) Only soap

4. Which among the following correctly defines Diastereomer?
a) These have same magnitude but different signs of optical rotation
b) Nonsuperimposable object mirror relationship
c) These differ in all physical properties
d) Separation is very difficult

5. The molecular formula C5H12 contains how many isomeric alkanes?
a) 1
b) 2
c) 3
d) 4

6. Identify the chiral molecule among the following:
a) Isopropyl alcohol
b) 2-pentanol
c) 1-bromo 3-butene
d) Isobutyl alcohol

THESE TYPE OF QUESTIONS AND MANY OTHER TYPES OF QUESTION

IF YOU HAVE TROUBLE IN DOING THE QUESTIONS RELATED TO ISOMERISM THEN THIS MEANS YOUR BASIC KNOWLEDGE IS NOT GOOD ABOUT ISOMERISM 

SO THAT I FIND  A PDF OF ISOMERISM WHICH WILL CLEAR YOUR BASIC KNOWLEDGE  ALONG WITH THIS 

HERE IS THE LINK OF THE PDF https://drive.google.com/file/d/19iOg43DPSrN0X1t7ggrcXkxIZ6RuXZgk/view?usp=sharing

                              Stereoisomerism 

The structural isomers discussed in Chapter 03 differ from each other in the order of attachment of the atoms. Consequently, these are molecules which are fundamentally different from each other, having different amounts of branching in their chains or different positions of functional groups or even possessing entirely different functional groups. As we have seen, it is relatively easy to describe the differences between these isomers using structural formulas in two dimensions. However, another type of isomerism, known as stereoisomerism, is much harder to describe on paper. This is because these molecules have atoms attached together in the same order, but differ from each other in their spatial (threedimensional) arrangement. You will find that your understanding of this topic will be greatly helped by looking at and building three-dimensional models of the different molecules. There are two types of stereoisomerism that we will discuss here, geometric (now more commonly known as cis- trans), and optical isomers.

Geometric isomers (cis-trans isomers) 

When there is some constraint in a molecule that restricts the free rotation of bonded groups, they become fixed in space relative to each other. So, where there are two different groups attached to each of the two carbon atoms that have restricted rotation, this gives rise to two different three-dimensional arrangements of the atoms known as geometric isomers.

Cis- refers to the isomer that has the same groups on the same side of the double bond or ring, while trans- is the isomer that has the same groups on opposite sides, or across the point of restricted rotation. These prefixes are given in italics before the name of the compound. Some examples of cis-trans isomerism in these circumstances are discussed below.

Cyclic molecules 

Cycloalkanes contain a ring of carbon atoms in which the bond angles are strained from the tetrahedral angles in the parent alkane. For example, in cyclopropane the carbon atoms form a triangle with bond angles of 60°, and in cyclobutane the atoms form a puckered square with approximate angles of 90°. The ring prevents rotation around the carbon atoms, so when there are two different groups attached to two carbons in the ring, these molecules can exist as the cis- and trans- forms

BY VIDIT VARSHNEY

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