In Class 11 Final Exams there will be Case studies and Passage Based Questions will be asked, So practice these types of questions. Study Rate is always there to help you. Free PDF Downloads of CBSE Class 11 Chemistry Chapter 12 Case Study and Passage-Based Questions with Answers were Prepared Based on the Latest Exam Pattern. Students can solve Class 11 Chemistry Case Study Questions Organic Chemistry -Some Basic Principles and Techniques to know their preparation level.
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In CBSE Class 11 Chemistry Paper, There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.
Organic Chemistry Case Study Questions With Answers
Here, we have provided case-based/passage-based questions for Class 11 Chemistry Chapter 12 Organic Chemistry -Some Basic Principles and Techniques
Case Study/Passage-Based Questions
Case Study 1: The three-dimensional (3-D) structure of organic molecules can be represented on paper by using certain conventions. For example, by using solid ( ) and dashed ( ) wedge formula, the 3-D image of a molecule from a two-dimensional picture can be perceived. In these formulas the solid-wedge is used to indicate a bond projecting out of the plane of paper, towards the observer. The dashed-wedge is used to depict the bond projecting out of the plane of the paper and away from the observer. Wedges are shown in such a way that the broad end of the wedge is towards the observer. The bonds lying in plane of the paper are depicted by using a normal line (—). 3-D representation of methane molecule on paper has been shown in Figure.
Cyclic or closed chain or ring compounds
a) Alicyclic compounds Alicyclic (aliphatic cyclic) compounds contain carbon atoms joined in the form of a ring (homocyclic).
These exhibit some of the properties similar to those of aliphatic compounds.
b) Aromatic compounds Aromatic compounds are special types of compounds. These include benzene and other related ring compounds (benzenoid). Like alicyclic compounds, aromatic comounds may also have hetero atom in the ring. Such compounds are called hetrocyclic aromatic compounds. Some of the examples of various types of aromatic compounds are:
Benzenoid aromatic compounds .
Organic compounds can also be classified on the basis of functional groups, into families or homologous series.
Functional Group The functional group is an atom or a group of atoms joined to the carbon chain which is responsible for the characteristic chemical properties of the organic compounds. The examples are hydroxyl group (–OH), aldehyde group (–CHO) and carboxylic acid group (–COOH) etc.
Homologous Series A group or a series of organic compounds each containing a characteristic functional group forms a homologous series and the members of the series are called homologues. The members of a homologous series can be represented by general molecular formula and the successive members differ from each other in molecular formula by a –CH2 unit. There are a number of homologous series of organic compounds. Some of these are alkanes, alkenes, alkynes, haloalkanes, alkanols, alkanals, alkanones, alkanoic acids, amines etc. It is also possible that a compound contains two or more identical or different functional groups. This gives rise to polyfunctional compounds.
A systematic name of an organic compound is generally derived by identifying the parent hydrocarbon and the functional group(s) attached to it. See the example given below.
By further using prefixes and suffixes, the parent name can be modified to obtain the actual name. Compounds containing carbon and hydrogen only are called hydrocarbons. A hydrocarbon is termed saturated if it contains only carbon-carbon single bonds.
The IUPAC name for a homologous series of such compounds is alkane. Paraffin (Latin: little affinity) was the earlier name given to these compounds. Unsaturated hydrocarbons are those, which contain at least one carbon- carbon double or triple bond. IUPAC Nomenclature of Alkanes Straight chain hydrocarbons: The names of such compounds are based on their chain structure, and end with suffix ‘-ane’ and carry a prefix indicating the number of carbon atoms present in the chain (except from CH4 to C4H10, where the prefixes are derived from trivial names). The IUPAC names of some straight chain saturated hydrocarbons are given in Table. The alkanes in table differ from each other by merely the number of – CH2 groups in the chain. They are homologues of alkane series.
[A] MCQ
1) IUPAC is an acronym for …
a) International Union of Pure and Applied Chemistry
b) International units of proteins and carbohydrates
c) International understanding on physical aspects of chemistry
d) Iodine under packings
Ans- a) International Union of Pure and Applied Chemistry
2) In homologous series, the successive members differ from each other in the molecular formula by a … unit.
a) CH3
b) CH2
c) CH
d) CH4
Ans- b) CH2
3) A hydrocarbon is termed saturated if it contains only carbon-carbon … bonds.
a) Triple
b) Double
c) Single
d) Zero
Ans- c) single
4) From ….., where the prefixes are derived from… trivial names.
a) CH4 to C2H6
b) CH4 to C3H8
c) CH4 to C6H14
d) CH4 to C4H10
Ans- d) CH4 to C4H10
5) Molecular formula of octane is …
a) C4H10
b) C6H14
c) C2H6
d) C8H18
Ans- d) C8H18
What is the function of the solid wedge ( ) in a 3-D representation of a molecule?
A) Represents a bond lying in the plane of the paper
B) Represents a bond projecting out of the plane of paper and away from the observer
C) Represents a bond projecting out of the plane of paper, towards the observer
D) Represents a bond in the ring of a cyclic compound
Answer: C
Which of the following groups would NOT be considered a functional group in an organic compound?
A) Hydroxyl group (–OH)
B) Aldehyde group (–CHO)
C) Carboxylic acid group (–COOH)
D) Alkane group
Answer: D
Which type of aromatic compound may contain a heteroatom in the ring?
A) Alicyclic compounds
B) Benzenoid aromatic compounds
C) Homologous series
D) Heterocyclic aromatic compounds
Answer: D
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