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Class 9 Exam  >  Class 9 Tests  >  Hydrocarbons - Practice Test (1) - Class 9 MCQ

Hydrocarbons - Practice Test (1) - Class 9 MCQ


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25 Questions MCQ Test - Hydrocarbons - Practice Test (1)

Hydrocarbons - Practice Test (1) for Class 9 2024 is part of Class 9 preparation. The Hydrocarbons - Practice Test (1) questions and answers have been prepared according to the Class 9 exam syllabus.The Hydrocarbons - Practice Test (1) MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Hydrocarbons - Practice Test (1) below.
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Hydrocarbons - Practice Test (1) - Question 1
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Which of these fuels not a Hydrocarbon?

Detailed Solution for Hydrocarbons - Practice Test (1) - Question 1

hydrogen, as hydrocarbon include both ‘C’ and ‘H’ .

Hydrocarbons - Practice Test (1) - Question 2
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The reaction given below is used to produce polythene. This is an example of _______ reaction

Detailed Solution for Hydrocarbons - Practice Test (1) - Question 2

Monomer units combine to form polymers.

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Hydrocarbons - Practice Test (1) - Question 3
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The addition of HBr to 1-butene gives a mixture of products A, B and C. The mixture consists of

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A and B both involve secondary carbocation but C involve primary carbocation.

Hydrocarbons - Practice Test (1) - Question 4
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The synthesis of 3-octyne is achieved by adding a bromoalkane into a mixture of sodium amide and an alkyne. The bromoalkane and alkyne respectively are
Detailed Solution for Hydrocarbons - Practice Test (1) - Question 4

BrCH2CH2CH2CH3and CH3CH2C ≡ CH

Hydrocarbons - Practice Test (1) - Question 5
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Phenyl magnesium bromide reacts with methanol to give
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Phenyl magnesium bromide reacts with methanol to give a mixture of benzene and Mg(OMe)Br , grignard reaction.

Hydrocarbons - Practice Test (1) - Question 6
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Saturated Hydrocarbons contain
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single bond.

Hydrocarbons - Practice Test (1) - Question 7
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The number of position isomers of C5H8 is
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n-pentyne, 3-methyl butyne, pent-2-yne

Hydrocarbons - Practice Test (1) - Question 8
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Which of the following will not show geometrical isomerism?
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As three groups are same.

Hydrocarbons - Practice Test (1) - Question 9
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One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 u. The alkene is
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2-butene on ozonolysis give two molecules of acetone

Hydrocarbons - Practice Test (1) - Question 10
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A gas decolourised by KMnO4 solution but gives no precipitate with ammoniacal cuprous chloride is
Detailed Solution for Hydrocarbons - Practice Test (1) - Question 10

Ethene due to unsaturation decolourise KMnO4 . But do not give precipitate with ammonical cuprous chloride.

Hydrocarbons - Practice Test (1) - Question 11
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in cycloalkanes carbon atoms form
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a ring or closed chain.

Hydrocarbons - Practice Test (1) - Question 12
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Thus ethyne molecule consists of
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Ethyne molecule consists of one C–C σ bond, two C–H σ bonds and two C–C π bonds.

Hydrocarbons - Practice Test (1) - Question 13
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Arrange the following hydrogen halides in order of their decreasing reactivity with propene.
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Due to weak bonding between hydrogen and iodine, due to large size of iodine.

Hydrocarbons - Practice Test (1) - Question 14
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n-propyl bromide on treating with alcoholic KOH produces
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Elimination reaction takes place.

Hydrocarbons - Practice Test (1) - Question 15
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What would be the product formed when 1-Bromo-3-chlorocyclobutane reacts with two equivalents of metallic sodium in ether?

(A) 

(B)

(C)

(D)

Detailed Solution for Hydrocarbons - Practice Test (1) - Question 15

Inta-molecular wurtz reaction.

Hydrocarbons - Practice Test (1) - Question 16
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Which of these is not a characteristic of aromatic Hydrocarbons?
Detailed Solution for Hydrocarbons - Practice Test (1) - Question 16

aromatic hydrocarbon are not open chained. They are ring structures.

Hydrocarbons - Practice Test (1) - Question 17
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In the preparation of alkynes from vicinal dihalides, the reaction is
Detailed Solution for Hydrocarbons - Practice Test (1) - Question 17

Twice the elimination reaction takes place, to form alkynes from vicinal dihalides.

Hydrocarbons - Practice Test (1) - Question 18
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Arrange the following carbanions in order of their decreasing stability.

(A) H3C – C ≡≡C–

(B) H – C ≡ C–

(C) H3C−−−CH2−−H3C−−−CH2−−
Detailed Solution for Hydrocarbons - Practice Test (1) - Question 18

‘sp’ hybridized, more ‘s character’ more stable ‘-’ charge.

Hydrocarbons - Practice Test (1) - Question 19
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The angle strain in cyclobutane is
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The angle strain in cyclobutane is 9°44′

Hydrocarbons - Practice Test (1) - Question 20
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2 methylbutane on reacting with bromine in the presence of sunlight gives mainly
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Free radical mechanism.

Hydrocarbons - Practice Test (1) - Question 21
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The number of chain isomers of C5H12 is
Detailed Solution for Hydrocarbons - Practice Test (1) - Question 21

2-methylbutane, 3-methylbutane, n-pentane.

Hydrocarbons - Practice Test (1) - Question 22
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Majority of the reactions of alkynes are the examples of
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as alkynes are electron rich species.

Hydrocarbons - Practice Test (1) - Question 23
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Arrange the following alkyl halides in decreasing order of the rate of β−−β−− elimination reaction with alcoholic KOH
Detailed Solution for Hydrocarbons - Practice Test (1) - Question 23

More substituted alkene is preferred by satzeff rule.

Hydrocarbons - Practice Test (1) - Question 24
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In the following sequence of reactions, the alkene affords the compound 'B' 

  

The compound B is
Detailed Solution for Hydrocarbons - Practice Test (1) - Question 24

Oxidative ozonolysis leads to formation of aldehyde.

Hydrocarbons - Practice Test (1) - Question 25
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Alkyl halides react with dialkyl copper reagents to give
Detailed Solution for Hydrocarbons - Practice Test (1) - Question 25

Alkyl halides react with dialkyl copper reagents to give alkanes .Reduction reaction.

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