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NEET UG Haloalkanes and Haloarenes — practice questions — page 2

Explore 92 free Haloalkanes and Haloarenes questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Haloalkanes and Haloarenes questions and exercises with answers

Showing questions 31–60 of 92.

Good yields of alkyl iodides come from heating alcohols with which mixture?Read the answer and worked solution →Phosphorus tribromide is usually generated in situ from which reactants?Read the answer and worked solution →Why can phenols not be turned into aryl halides like alcohols can?Read the answer and worked solution →What is the main drawback of free radical chlorination of alkanes?Read the answer and worked solution →Propene adds HBr by Markovnikov's rule. What is the major product?Read the answer and worked solution →Discharge of bromine's reddish brown colour in CCl4 detects what?Read the answer and worked solution →Alkyl bromide heated with NaI in dry acetone gives alkyl iodide. Name it.Read the answer and worked solution →What drives the Finkelstein reaction forward?Read the answer and worked solution →The Swarts reaction makes alkyl fluorides using which reagents?Read the answer and worked solution →Iodination of benzene needs which added reagent to proceed?Read the answer and worked solution →A benzene diazonium salt gives chlorobenzene when mixed with what?Read the answer and worked solution →Iodobenzene is made from a diazonium salt by shaking it with what?Read the answer and worked solution →For the same alkyl group, what is the boiling point order of halides?Read the answer and worked solution →Why do alkyl iodides boil higher than alkyl chlorides?Read the answer and worked solution →Which C4H9Br isomer has the lowest boiling point?Read the answer and worked solution →Why are haloalkanes only very slightly soluble in water?Read the answer and worked solution →A haloalkane reacts with KCN. What is the main product?Read the answer and worked solution →Why does AgCN give mainly isocyanides with haloalkanes?Read the answer and worked solution →Nitrite ion attacking a haloalkane through nitrogen gives what?Read the answer and worked solution →What order of kinetics does CH3Cl with hydroxide ion follow?Read the answer and worked solution →How many steps does an SN2 reaction take?Read the answer and worked solution →What is the SN2 reactivity order of alkyl halides?Read the answer and worked solution →What intermediate forms in the slow step of an SN1 reaction?Read the answer and worked solution →Which bromide reacts fastest by the SN1 mechanism?Read the answer and worked solution →A dextrorotatory compound rotates plane polarised light in which way?Read the answer and worked solution →In which year did Van't Hoff and Le Bel propose the tetrahedral carbon?Read the answer and worked solution →Which of these molecules is achiral?Read the answer and worked solution →What is the net optical rotation of a racemic mixture?Read the answer and worked solution →Optically active 2-bromobutane is hydrolysed by SN1. What forms?Read the answer and worked solution →(-)-2-Bromooctane reacts with NaOH by SN2. What is the product?Read the answer and worked solution →

Worked practice questions

Good yields of alkyl iodides come from heating alcohols with which mixture?

  1. Iodine in CCl4
  2. KI in conc. H2SO4
  3. KI in 95% H3PO4
  4. NaI in dry ether
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Correct answer: C. KI in 95% H3PO4

Sodium or potassium iodide in 95% orthophosphoric acid converts alcohols to alkyl iodides.

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Phosphorus tribromide is usually generated in situ from which reactants?

  1. White phosphorus and HBr
  2. Phosphoric acid and NaBr
  3. Phosphorus oxide and Br2
  4. Red phosphorus and bromine
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Correct answer: D. Red phosphorus and bromine

Red phosphorus reacts with bromine inside the reaction mixture to give PBr3.

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Why can phenols not be turned into aryl halides like alcohols can?

  1. Phenols are very volatile
  2. C-O bond is partly double
  3. Phenols are strong bases
  4. Phenols lack an OH group
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Correct answer: B. C-O bond is partly double

The C-O bond in phenols has partial double bond character, so it is hard to break.

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