11th Chemistry Monthly Test - 1 ( Hydrocarbons )

MABS Institution

11th Chemistry Monthly Test - 1 ( Hydrocarbons )-Aug 2020

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Statement - I: Boiling point of methane is lower than that of butane.
Statement - II: The boiling point of continuous chain alkanes increases with increase in length of carbon chain.

Statement -I and II are correct and statement - II is correct explanation of statement - I
Statement-I and II are correct but statement - II is not correct explanation of statement-I
Statement - II is correct but statement - II is wrong.
Statement - II is wrong but statement - I is correct

Which one is not prepared by inurtz reaction?

C₂H₆
nC₄H₁₀
CH₄
\({ CH }_{ 3 }-\overset { \underset { | }{ { CH }_{ 3 } } }{ CH } -\overset { \underset { | }{ { CH }_{ 3 } } }{ CH } -{ CH }_{ 3 }\)

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is

the eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has torsional strain
the staggered conformation of ethane is more stable than eclipsed conformatio, because staggered conformation has no torsional strain
the staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain
the staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has no torsional strain

Consider the nitration of benzene using mixed con H₂SO₄ and HNO₃ if a large quantity of KHSO₄ is added to the mixture, the rate of nitration will be

unchanged
doubled
faster
slower

Which one of the following is not an ortho-para director?

- NO₂
-CH₃
-OH
-C₂H₅

In the following reaction,

The major product obtained is

The incorrect match is

Total number of conformations possible in cyclohexane is

Zero
Infinite
Four
Two

Which is maximum stable?

But-l-ene
cis-but-2-ene
trans-but-2-ene
All have equal

Which of the following compound cannot be prepared by Kolbe's electrolytic method?

CH₃-CH₃
CH₄
CH₂ = CH₂
CH u2630 CH

Part - B

Generic 2 - Answer All Question

Convert bromo benzene to toluene and name the process.

What are decarboxylation reactions? Given an example.

Write the chemical equations for combustion of propane.

How will you convert ethyl chloride in to
i) ethane
ii) n – butane

Peroxide effect is observed only in HBr and not in HCl or HI. Justify.
Write a note on methane clathrates.

Prove - All the six hydrogens in benzene are identical.

Cis-isomers are less stable than trans-isomers?

Identify A, Band C from the following equation

What is peroxide effect? Give example.

Part - C

Generic 3 - Answer All Question

State Huckel's rule of aromaticity and explain it interms of cyclopentadiene, cycloxtateraene and cyclopropenylcation.

What happens when ealkane is,
(i) burnt in air
(ii) aromatized
(iii) reacted with steam?

Write a brief note on polymerisation of alkenes.

Explain the carcinogenity and toxicity of aromatic hydrocarbons.

What is BHC? How will you prepare BHC? Mention its uses.

Explain how to draw the structural formula for 3-ethyl, 2, 3-dimethylpentane.
Explain the molecular orbirtal structure of benzene.

Write an account on the following reactions involving formation of alkane.
(i) Kolbe's Electrolytic method
(ii) Wurtz reaction
(iii) Carey - House Mechanism

What is polymerisation? Explain with suitable example.

In aryl halides, halogen group is a ortho-para director and a deactivator towards electrophilic substitution reactions, why?

Part - D

Generic 5 - Answer All Question

An organic compound (A) of molecular formula C₂H₄ which is a simple alkene reacts with Baeyer's reagent to give B of molecular formula C₂H₆O₂• A again reacts with ozone followed by hydrolysis in the presence of zinc to form C of molecular formula CH₂O. Identify A, B and C. Explain with reactions.

Eludicate the differences in relative stability of conformations.

Explain the structure of benzene.

Explain the acidic nature of alkynes.

Explain various methods of preparation of alkane.

Write only the equations representing the electrophilic substitution in benzene.

Give IUPAC names for the following compounds
1) CH₃ – CH = CH – CH = CH – C ≡ C – CH₃
2)
3) (CH₃)₃ C – C ≡ C – CH (CH₃)₂
4) ethyl isopropyl acetylene
5) CH ≡ C – C ≡ C – C ≡ CH

Elucidate the structure of benzene in detail.
Explain the conformational analysis of ethane.

What are ortho-para directors? Explain why -OH group is an ortho-para director and activator.

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11th Chemistry Monthly Test - 1 ( Hydrocarbons )

MABS Institution

11th Chemistry Monthly Test - 1 ( Hydrocarbons )-Aug 2020

Part - A

Multiple Choice Question - Answer All Question

Statement - I: Boiling point of methane is lower than that of butane. Statement - II: The boiling point of continuous chain alkanes increases with increase in length of carbon chain.

Which one is not prepared by inurtz reaction?

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is

Consider the nitration of benzene using mixed con H2SO4 and HNO3 if a large quantity of KHSO4 is added to the mixture, the rate of nitration will be

Which one of the following is not an ortho-para director?

In the following reaction, The major product obtained is

The incorrect match is

Total number of conformations possible in cyclohexane is

Which is maximum stable?

Which of the following compound cannot be prepared by Kolbe's electrolytic method?

Part - B

Generic 2 - Answer All Question

Convert bromo benzene to toluene and name the process.

What are decarboxylation reactions? Given an example.

Write the chemical equations for combustion of propane.

How will you convert ethyl chloride in to i) ethane ii) n – butane

Peroxide effect is observed only in HBr and not in HCl or HI. Justify.

Write a note on methane clathrates.

Prove - All the six hydrogens in benzene are identical.

Cis-isomers are less stable than trans-isomers?

Identify A, Band C from the following equation

What is peroxide effect? Give example.

Part - C

Generic 3 - Answer All Question

State Huckel's rule of aromaticity and explain it interms of cyclopentadiene, cycloxtateraene and cyclopropenylcation.

What happens when ealkane is, (i) burnt in air (ii) aromatized (iii) reacted with steam?

Write a brief note on polymerisation of alkenes.

Explain the carcinogenity and toxicity of aromatic hydrocarbons.

What is BHC? How will you prepare BHC? Mention its uses.

Explain how to draw the structural formula for 3-ethyl, 2, 3-dimethylpentane.

Explain the molecular orbirtal structure of benzene.

Write an account on the following reactions involving formation of alkane. (i) Kolbe's Electrolytic method (ii) Wurtz reaction (iii) Carey - House Mechanism

What is polymerisation? Explain with suitable example.

In aryl halides, halogen group is a ortho-para director and a deactivator towards electrophilic substitution reactions, why?

Part - D

Generic 5 - Answer All Question

An organic compound (A) of molecular formula C2H4 which is a simple alkene reacts with Baeyer's reagent to give B of molecular formula C2H6O2• A again reacts with ozone followed by hydrolysis in the presence of zinc to form C of molecular formula CH2O. Identify A, B and C. Explain with reactions.

Eludicate the differences in relative stability of conformations.

Explain the structure of benzene.

Explain the acidic nature of alkynes.

Explain various methods of preparation of alkane.

Write only the equations representing the electrophilic substitution in benzene.

Give IUPAC names for the following compounds 1) CH3 – CH = CH – CH = CH – C ≡ C – CH3 2) 3) (CH3)3 C – C ≡ C – CH (CH3)2 4) ethyl isopropyl acetylene 5) CH ≡ C – C ≡ C – C ≡ CH

Elucidate the structure of benzene in detail.

Explain the conformational analysis of ethane.

What are ortho-para directors? Explain why -OH group is an ortho-para director and activator.

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11th Chemistry Weekly Test - 1 ( Solutions )

Statement - I: Boiling point of methane is lower than that of butane.
Statement - II: The boiling point of continuous chain alkanes increases with increase in length of carbon chain.

Consider the nitration of benzene using mixed con H₂SO₄ and HNO₃ if a large quantity of KHSO₄ is added to the mixture, the rate of nitration will be

In the following reaction,

The major product obtained is

How will you convert ethyl chloride in to
i) ethane
ii) n – butane

What happens when ealkane is,
(i) burnt in air
(ii) aromatized
(iii) reacted with steam?

Write an account on the following reactions involving formation of alkane.
(i) Kolbe's Electrolytic method
(ii) Wurtz reaction
(iii) Carey - House Mechanism

Give IUPAC names for the following compounds
1) CH₃ – CH = CH – CH = CH – C ≡ C – CH₃
2)
3) (CH₃)₃ C – C ≡ C – CH (CH₃)₂
4) ethyl isopropyl acetylene
5) CH ≡ C – C ≡ C – C ≡ CH