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Organic Chemistry : Some Basic Principles - Practice Test (1) - Class 9 MCQ


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25 Questions MCQ Test - Organic Chemistry : Some Basic Principles - Practice Test (1)

Organic Chemistry : Some Basic Principles - Practice Test (1) for Class 9 2024 is part of Class 9 preparation. The Organic Chemistry : Some Basic Principles - Practice Test (1) questions and answers have been prepared according to the Class 9 exam syllabus.The Organic Chemistry : Some Basic Principles - Practice Test (1) MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Organic Chemistry : Some Basic Principles - Practice Test (1) below.
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Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 1
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Hybridisation in methane (CH4), ethene (C2H4), ethyne (C2H2) involves s and p orbitals. Choose the correct hybrid orbitals in the options given below for CH4, C2H4CH4, C2H4 and, C2H4 respectively

Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 1

In methane C is sp3 hybridised because of 3 sigma bond formation. While in ethane C is sp2 hybridised and in ethyne it is sp hybridised

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 2
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Correct IUPAC name the following compound is

Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 2

Longest carbon chain is containg two 2 ethyl group
3,4- dimethylhexane will be correct iupac name as 6 membered carbon chain will be the main chain.

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Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 3
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In which of the following, functional group isomerism is not possible?

Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 3

alkyl halides donot give alkyl halides.

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 4
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The technique that is extensively used to separate mixtures into their components, purify compounds and also to test the purity of compounds is
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 4

Chromatography is used to separate mixtures of substances into their components. All forms of chromatography work on the same principle. They all have a stationary phase (a solid, or a liquid supported on a solid) and a mobile phase (a liquid or a gas).

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 5
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Electrophiles are electron seeking species. Which of the following groups contain only electrophiles?

(i) 

(ii)

(iii)

(iv) 

Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 5

(ii) and (iii) contains all the electrophiles.

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 6
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Change in hybridisation affects the carbon’s and the organic compound’s
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 6

in hybridization as % s character increases electronegativity also increases.

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 7
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Benzene and other related ring compounds (benzenoid) such as given below are called:
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 7

they are aromatic system as they have benzene ring intact.

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 8
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The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flowers is:
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 8

A suitable method for the extraction of these oils from the flowers is Steam distillation

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 9
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Aniline is separated by technique from aniline . water mixture
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 9

They are separated by steam distillation.

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 10
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In the four compounds below, which of the following pairs are position isomers? (i) I and II (ii) II and III(iii) II and IV(iv) III and IV
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 10

(I) and (II) will be position isomer as they have same chain legth while they only differs in the position of carbonyl functional group.

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 11
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Condense the following complete structural formula given below. Choose the appropriate answer given below
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 11

All the single bonds are broken and atoms are written together.

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 12
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The following compound is called 
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 12

this is known as tropolone. It is polar and aromatic.

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 13
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During hearing of a court case, the judge suspected that some changes in the documents had been carried out. He asked the forensic department to check the ink used at two different places. According to you which technique can give the best results?
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 13

TLC will give the best results.

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 14
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Sodium cyanide, sulphide and halide,( -CN, -S and -H, coming from organic compound) so formed on sodium fusion are extracted from the fused mass by boiling it with distilled water. This is called
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 14

This is lassaignes test.

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 15
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In Carius method, the organic compound is heated with
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 15

fuming nitric acid is used.

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 16
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2-bromo butane can be represented in various ways. Choose the incorrect one from the following
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 16

A will be wrong as terminal group represent methyl group not bromine.

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 17
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Compounds contain carbon atoms joined in the form of a ring are called
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 17

they are known as alicyclic compounds.

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 18
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The principle involved in paper chromatography is
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 18

Paper chromatography is based on the principle of partition

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 19
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Geometrical isomers and Optical isomers are:
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 19

They are stereoisomers as they differ in the orientation of atoms in space.

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 20
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Write the state of hybridisation of carbon in the compound, HC≡≡N and shapes of each of the molecules
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 20

C is sp hybridized and is linear in shape.

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 21
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Which of the following is the correct IUPAC name?
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 21

4, 4-Dimethyl-3-ethylheptane is correct iupac name.

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 22
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The molecular formula C3H8O represents two alcohols: propan-1-ol and propan-2-ol. This property is called
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 22

propan-1-ol and propan-2-ol are positional isomers as they differ ony in the position of functional group.

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 23
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In which of the following compounds the carbon marked with asterisk is expected to have greatest positive charge?
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 23

Cl is more electronegative.

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 24
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When an organic compound is present in an aqueous medium, it is separated by
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 24

They are separated by differential extraction.

Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 25
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In sulphur estimation, 0.157 g of an organic compound gave 0.4813 g of barium sulphate. What is the percentage of sulphur in the compound?
Detailed Solution for Organic Chemistry : Some Basic Principles - Practice Test (1) - Question 25

moles of BaSO4 = moles of S = 0.418/(137+32+64) = 0.002065 moles % of S = 0.002065×32 × 100/0.157 = 42.10%

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