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NEET UG Hydrocarbons — practice questions — page 3

Explore 129 free Hydrocarbons questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Hydrocarbons questions and exercises with answers

Showing questions 61–90 of 129.

Breaking higher alkanes into smaller molecules by heat is:Read the answer and worked solution →Arrangements interconverted by rotation about a C-C single bond are:Read the answer and worked solution →Energy difference between staggered and eclipsed ethane is about:Read the answer and worked solution →In which projection is the rear carbon drawn as a circle?Read the answer and worked solution →Alkenes are called olefins, a name meaning:Read the answer and worked solution →The pi bond of C=C is weaker than its sigma bond because of:Read the answer and worked solution →Bond enthalpy of the C≡C bond in ethyne is about:Read the answer and worked solution →Loosely held pi electrons make alkenes react mainly with:Read the answer and worked solution →Methene is short lived. The first stable alkene is:Read the answer and worked solution →But-1-ene and but-2-ene are an example of:Read the answer and worked solution →Cis-trans isomerism in alkenes arises because:Read the answer and worked solution →In a cis alkene, the two identical groups lie:Read the answer and worked solution →trans-But-2-ene has nearly zero dipole moment because:Read the answer and worked solution →Compared with the cis isomer, a solid trans alkene usually has:Read the answer and worked solution →Partial hydrogenation of an alkyne over Lindlar's catalyst gives:Read the answer and worked solution →Reducing an alkyne with sodium in liquid ammonia gives:Read the answer and worked solution →For dehydrohalogenation with alcoholic KOH, the halogen order is:Read the answer and worked solution →Dihalides with halogens on adjacent carbon atoms are called:Read the answer and worked solution →Vicinal dihalides heated with zinc metal give:Read the answer and worked solution →Alcohols heated with concentrated H2SO4 form alkenes by:Read the answer and worked solution →Ethene is a colourless gas with:Read the answer and worked solution →Reactivity of hydrogen halides towards alkenes follows:Read the answer and worked solution →By Markovnikov's rule, the negative part of the adding molecule goes to the carbon with:Read the answer and worked solution →Propene with HBr and no peroxide gives mainly:Read the answer and worked solution →Anti-Markovnikov addition of HBr with peroxide is called the:Read the answer and worked solution →The peroxide effect does not occur with HCl because:Read the answer and worked solution →Propene with water and a little concentrated H2SO4 gives mainly:Read the answer and worked solution →In ozonolysis, the ozonide is cleaved using:Read the answer and worked solution →Ozonolysis of but-2-ene gives:Read the answer and worked solution →Polythene is made by polymerising:Read the answer and worked solution →

Worked practice questions

Breaking higher alkanes into smaller molecules by heat is:

  1. Hydrolysis
  2. Polymerisation
  3. Pyrolysis
  4. Isomerisation
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Correct answer: C. Pyrolysis

Thermal decomposition of alkanes into smaller fragments is called pyrolysis or cracking.

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Arrangements interconverted by rotation about a C-C single bond are:

  1. Configurations
  2. Conformations
  3. Tautomers
  4. Enantiomers
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Correct answer: B. Conformations

Spatial forms reached just by rotating about a sigma bond are conformers or rotamers.

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Energy difference between staggered and eclipsed ethane is about:

  1. 125 kJ/mol
  2. 12.5 kJ/mol
  3. 48 kJ/mol
  4. 1.25 kJ/mol
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Correct answer: B. 12.5 kJ/mol

The two extreme ethane conformations differ by roughly 12.5 kJ per mole.

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More Chemistry topics

Amines and BiomoleculesChemical KineticsAldehydes, Ketones and Carboxylic AcidsEquilibriumRedox ReactionsChemical Bonding and Molecular StructureSolutionsStructure of Atom