CBSE Class 12 Chemistry Halo alkanes and Haloarene Questions Answers

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Halo alkanes and Haloarene

     • One Mark Questions:

1. Give IUPAC name of the following organic compound:

CH3-CH=C- CH-CH3

              CH3 Br

2. Write the structural formulae of 4-Chloropent-2-ene.

Q3.Arrange the following halides in order of increasing SN2 reactivity

CH3Cl,CH3Br,CH3CH2Cl, (CH3)2CHCl

Q4.What is the order of reactivity of different alkyl halides in nucleophilic substitution reaction?

Q5.An alkyl halide C4H9Cl is optically active. What is its structure?

Q7.Which type of solvents are generally used to carry out SN1 reaction?

Q8.Identify the chiral and achiral molecules in following pair of compounds?

A:CH3CHCH2CH3                        B :CH3CH2CH2CH2Br

           Br

Q9.Give two uses of iodoform (CHI3)?

Q10.Write a chemical reaction in which iodide ion displaces diazonium group from a diazonium salt?

Q11.How you will convert 2-Bromopropane to 1-bromopropane?

Q13.How you will convert aniline into cholobenzene?

Q14.Name the iodine containing hormone, the deficiency of which causes goiter?

Q15.Name the synthetic halogen compound which is used in treatment of malaria?

Q16.Which isomer of C4H9Br will have lowest boiling point?

Q17.Write the IUPAC name of DDT?

Q18.Why sulphuric acid is not used during reaction of alcohol with KI?

Q19.Out of CH3Br and CH3Cl which will have higher boiling point and why?

Q20.Which one of following has highest dipole moment?

      • i) CH2Cl2 (ii) CHCl3 (iii) CCl4

      • Two marks questions:

Q1.Define the following terms:

     • i) Ambidient nucleophile (ii) Chirality

Q2.Write short note on sandmeyer reaction?

Q3.Write the structures of main products:

(i).Chlorination of benzene in presence of UV light.

(ii).Propene is treated with HBr in presence of benzoyl peroxide.

Q4.Complete the following reactions:

(i).C6H5N2Cl +KI -----> ?

(ii) CH2=CH2 +Br2 ----- CCl4 -------->?

Q5.Explain why haloarenes are much less reactive than haloalkanes towards nucleophilic substitution reaction?

Q6.Write short note on:

(i).Wurtz reaction

(ii).Wurtz-Fittig reaction.

Q7.How you will convert:

(i).Ethyl chloride into ethyl alcohol.

(ii).Ethyl chloride to ethane

Q8.Alkyl halides are insoluble in water though they contain polar C-X bond ?

Q9.Give one test to distinguish between:

(i).Chloroform and carbontetrachloride

(ii).Methanol and ethanol.

Q10.Write short note on :

(i).Finkelstein reaction

(ii).Swarts reaction

• Three Marks Questions:

     1.Explain why:

(a).Dipole moment of cholorobenzene is lower than cyclohexyl chloride.

(b).Grignard reagent should be prepared under anhydrous conditions?

(c).Chloroform is stored in dark Brown bottles?

Q2.What happens when:

(a).Ethyl chloride treated with alcoholic KOH

(b).Alcohol reacts with thionyl chloride?

Q3.How you will conert:

(a).Chlorobenzene into toluene

(b).Chlorobenzene to phenol

(c).Ethyl bromide to diethyl ether.

Q5.Give the chemical test to distinguish between following pair of compounds: 

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