NEET Chemistry - New - Hydrocarbons

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Question - 1

Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtzreaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is:

  • A CH3 - CH3
  • B CH2 = CH2
  • C CH ≡ CH
  • D CH4

Question - 2

With respect to the conformers of ethane, which of the following statements is true?

  • A Bond angles remains same but bond length changes
  • B Bond angle changes but bond length remains same
  • C Both bond angle and bond length change
  • D Both bond angle and bond length remain same.

Question - 3

Which of the following compounds shall not produce propene by reaction with HBr followed by elimination or direct only elimination reaction?

  • A
  • B \({ H }_{ 3 }C-\overset { \underset { | }{ { H }_{ 2 } } }{ C } -{ CH }_{ 2 }OH\)
  • C H2C=C=O
  • D \({ H }_{ 3 }C-\overset { \underset { | }{ { H }_{ 2 } } }{ C } -{ CH }_{ 2 }Br\)

Question - 4

The compound that will react most readily with gaseous bromine has the formula:

  • A C3H6
  • B C2H6
  • C C4H10
  • D C2H4

Question - 5

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

  • A the eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has torsional strain
  • B the staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain
  • C the staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain
  • D the eclipsed conformation of ethane is more stable than staggered conformation, because eclipsed conformation has no torsional strain.

Question - 6

In the reaction with HCI, an alkene reacts in accordance with the Markovnikov's rule to give a product 1-chloro-1 methyl cyclohenxane. The possible alkene is:

  • A
  • B
  • C (a) and (b)
  • D

Question - 7

2, 3-Dimethyl-2-butene can be prepared by heating which of the following compounds with a strong acid?

  • A (CH3)3 CCH = CH2
  • B (CH3)2 C = CHCH2CH3
  • C (CH3)2CHCH2CH = CH2
  • D (CH3)2CH - \(\underset { { { CH }_{ 3 } } }{ \underset { | }{ CH } } \) - CH = CH2

Question - 8

  • A \({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -C{ H }_{ 2 }-{ CH }_{ 2 }Br\)
  • B \({ CH }_{ 3 }-\overset { \underset { | }{ Br } }{ \underset { { \overset { | }{ CH } }_{ 3 } }{ C } } -C{ H }_{ 2 }{ CH }_{ 2 }\)
  • C \({ CH }_{ 3 }-\underset { \overset { | }{ Br } }{ CH } -\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -{ CH }_{ 3 }\)
  • D \({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -\underset { \overset { | }{ Br } }{ CH } -{ CH }_{ 3 }\)

Question - 9

How many stereoisomers does this molecule has?
CH3CH = CHCH2CHBrCH3

  • A 4
  • B 6
  • C 8
  • D 2

Question - 10

Which of the following compounds with molecular formula, C5H10 yields acetone on ozonolysis?

  • A 2-methyl-2-butene
  • B 3-methyl-l-butene
  • C Cyciopentane
  • D 2-methyl-l-butene