CHEMISTRY QUESTIONS

1) A solution of KOH hydrolyses CH₃CHClCH₂CH₃ and CH₃CH₂CH₂CH₂Cl. Which one of these is more easily hydrolysed?

 

2)Give the IUPAC name of the following compound :

3)Write the IUPAC name of the following compound : (CH₃)₃ CCH₂Br

 

4)Write the IUPAC name of the following compound : (CH₃)₃ CCH₂Br

 

5)Write the IUPAC name of the following compound

6)What happens when bromine attacks
CH₂ = CH – CH₂ – C ≡ CH

 

7)Write the IUPAC name of the following

8)In the following pair of compounds, which will react faster by S_N1 mechanism and why?

9)Predict the order of reactivity of four isomeric bromobutanes in S_N1 reaction.

 

10)Draw the structure of major monohalogen product in the following reaction

 

11)Give a chemical test to distinguish between C₂H₅Br and C₆H₅Br.

 

2 marks

 

1)Which one in the following pairs of substances undergoes S_N2 substitution reaction faster and why?

 

2)Which one in the following pairs undergoes S_N1 substitution reaction faster and why? How are the following conversions carried out?
(i) Benzyl chloride to benzyl alcohol,
(ii) Methyl magnesium bromide to 2-methyl- propan-2-ol.

3)Complete the following reaction equations

Haloalkanes undergo nucleophilic substitution whereas haloarenes undergo electrophilic substitution. Explain.

4)Chlorobenzene is extremely less reactive towards a nucleophilic substitution reaction. Give two reasons for the same.

 

5)Account for the following:
(i) The C – Cl bond length in chlorobenzene is shorter than that in CH₃ – Cl.
(ii) Chloroform is stored in closed dark brown bottles.

 

6)Draw the structure of major monohalo product in each of the following reactions :

7)Write the equations for the preparation of 1-bromobutane from :
(i) 1-butanol (ii) but-l-ene

 

8)Which compound in each of the following pairs will react faster in S_N2 reaction with —OH?
(i) CH₃Br or CH₃I (ii) (CH₃)₃ CCl or CH₃Cl

 

9)How will you carry out the following conversions :
(i) 2-Bromopropane to 1-bromopropane
(ii) Benzene to p-chloronitrobenzene

 

10)How would you differentiate between S<subN1 and S_N2 mechanisms of substitution reactions? Give one example of each.

 

11)

1. a) Draw the structures of major monohalo products in each of the following reactions :(b) Which halogen compound in each of the following pairs will react faster in S_N2 reaction :
   (i) CH₃Br or CH₃I
   (ii) (CH₃)₃C – Cl or CH₃– Cl