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NEET UG Organic Chemistry: Some Basic Principles and Techniques — practice questions — page 4

Explore 101 free Organic Chemistry: Some Basic Principles and Techniques questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Organic Chemistry: Some Basic Principles and Techniques questions and exercises with answers

Showing questions 91–101 of 101.

A major resonance contributor places any negative charge on theRead the answer and worked solution →All carbon-carbon bonds in benzene measure aboutRead the answer and worked solution →How many dibromobenzene isomers actually exist?Read the answer and worked solution →In a carboxylate ion RCOO-, the negative charge isRead the answer and worked solution →The better the negative charge of an anion is delocalised, theRead the answer and worked solution →Unlike typical alkenes, benzene mainly undergoesRead the answer and worked solution →Structural isomers have the same molecular formula but differ inRead the answer and worked solution →Propanal and acetone are an example of which type of isomerism?Read the answer and worked solution →Propan-1-ol and propan-2-ol are related asRead the answer and worked solution →Butanol and diethyl ether are isomers sharing which molecular formula?Read the answer and worked solution →Which compound is a structural isomer of urea?Read the answer and worked solution →

Worked practice questions

A major resonance contributor places any negative charge on the

  1. Most electropositive atom
  2. Largest atom present
  3. Most electronegative atom
  4. Least substituted carbon
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Correct answer: C. Most electronegative atom

An electronegative atom holds extra electron density best, so a structure with the negative charge there is lower in energy.

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All carbon-carbon bonds in benzene measure about

  1. 139 pm
  2. 154 pm
  3. 120 pm
  4. 133 pm
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Correct answer: A. 139 pm

Delocalisation makes every ring bond equal at about 139 pm, between the 154 pm single bond and 133 pm double bond.

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How many dibromobenzene isomers actually exist?

  1. Four
  2. Three
  3. Two
  4. Six
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Correct answer: B. Three

Only ortho, meta and para forms exist, which shows the two possible ortho bonds of a fixed Kekule ring are not distinct.

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More Chemistry topics

Amines and BiomoleculesChemical KineticsAldehydes, Ketones and Carboxylic AcidsEquilibriumRedox ReactionsHydrocarbonsChemical Bonding and Molecular StructureSolutions