CBSE Class 12 Chemistry Haloalkanes And Haloarenes Worksheet Set 04

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HALOALKANES AND HALOARENES
 
1 A solution of KOH hydrolyses CH3CHClCH2CH3 and CH3CH2CH2CH2Cl. Which one of these is more easily hydrolyzed?
 
2 Draw the structure of the following compounds:
 
a) 4- Bromo-3-methylpent-2-ene
 
b) 4-sec-butyl-1-chloromethyl-2-methylbenzene
 
c) 4-tert-Butyl-3-iodoheptane.
 
d) isohexyl bromide
 
e) neopentyl iodide
 
f) Allyl bromide
 
3 Write a chemical test to distinguish between:
 
a) Chlorobenzene and Benzyl chloride
 
b) Chloroethane and bromoethane
 
c) 1-Chloropropene and 3-chloropropene
 
4 An optically active compound having molecular formula C4H9Br reacts with aq. KOH to give a racemic mixture of products. Write the mechanism involved for the reaction.
 
5 Arrange in increasing order of property mentioned giving reasons:
 
a) Ethanol and ethyl chloride ( solubility in water)
 
b) 2-Bromo-2-methylbutane, 1-bromopentane, 2-bromopentane (reactivity towards SN2)
 
c) 2-Bromobutane, 2-Bromo-2-methylpropane, 1-Bromopropane and 1-Bromobutane.(Boiling point)
 
6 Explain why?
 
a) Dipole moment of Chlorobenzene is lower than that of Cyclohexylchloride.
 
b) Alkyl halides, though polar are immiscible with water.
 
c) p-Dichlorobenzene has higher melting point and lower solubility than those of o and m-isomers.
 
d) 1-Chloropentane has more boiling point than 2-methyl-2-chlorobutane.
 
e) Vinyl chloride is less reactive than ethyl chloride towards SN reaction
 
7 How would you differentiate between SN1 and SN2 mechanisms of substitution?Give one example of each.
 
8 Write short note on the following:
 
a) Sandmeyer reaction
 
b) Finkelstein reaction
 
c) Wurtz reaction.
 
d) Fittig reaction
 
9 What happens when
 
a) Ethyl chloride is treated with NaI in the presence of acetone
 
b) Chlorobenzene is treated with Na metal in the presence of dry ether
 
c) Methyl chloride is treated with KNO2?
 
d) Ethyl chloride is treated with magnesium in dry ether followed by hydrolysis Write chemical equations in support of your answer.
 
10 Give the IUPAC name of the following:
 
a) (CH3)3CCH2CH(Br)C6H5
 
b) CH3C(C2H5)2CH2Br
 
c) CH3CH=C(Cl)CH2CH(CH3)2
 
d) CHF2CBrClF
 
e) (CH3)3CCH=CClC6H5
 
f) p-ClC6H4CH2CH(CH3)2
 
g) CH2 =C (CH3)CH2Br
 
11 Give reasons:
 
a) Racemisation occurs in SN1 reactions
 
b) Alkyl halides have higher boiling points than corresponding hydrocarbons.
 
c) Benzylic and allylic halides follow SN1 mechanism.
 
d) Halogens are deactivating but ‘o, p’ directive.
 
e) Haloarenes cannot be prepared from alcohols
 
f) Presence of electron withdrawing groups on benzene ring increases tendency of SN reaction.
 
g) Chloroform is stored in dark brown bottle.
 
h) Haloalkanes are more reactive than haloarenes towards nucleophilic substitution reactions.
 
i) Con HNO3 or HIO4 is used for the preparation of iodobenzene.
 
j) Neopentylbromide undergo nucleophilic substitution reactions very slowly.
 
12 Bring about the following conversions:
 
a) Benzene to 4-bromonitrobenzene
 
b) Benzyl alcohol to 2-phenylethanoic acid
 
c) Toluene to benzylalcohol
 
d) Propene to propan-1-ol
 
e) Chlorobenzene to toluene
 
13 Predict the product in the following:
 
a) 2-Bromo-3-methylpentane is treated with alcoholic KOH
 
b) Benzyl chloride is treated with magnesium in dry ether followed by hydrolysis.
 
c) 2-Bromopropane is treated with alcoholic KCN followed by hydrolysis.
 
14 Explain the following with examples
 
a) Ambident nucleophile
 
b) Enantiomers
 
c) Freons
 
d) DDT
 
e) Racemic mixture
 
15 Name the reagents used to convert and also write the reactions
 
a) Propene to allyl chloride
 
b) Ethyl chloride to ethoxy benzene
 
c) Chlorobenzene to toluene
 
d) Methyl iodide to propyne
 
16 Consider the three types of replacement of group X by group Y as shown here:
CBSE Class 12 Chemistry Haloalkanes And Haloarenes Worksheet Set A 1
 
This can result in giving compound A or B or both. What is the process called if
 
a) (A) is the only compound obtained.
 
b) (B) is the only compound obtained
 
c) (A) and (B) are formed in equal proportions
 
17 Among the isomeric alkanes of molecular formula C5H12. Identify the one that on photochemical chlorination yields:
 
a) A single monochloride which does not gives elimination reaction.
 
b) Three isomeric monochloride
 
c) Four isomeric monochlorides
 
18 Identify A, B and R in the following sequence of reactions:
CBSE Class 12 Chemistry Haloalkanes And Haloarenes Worksheet Set A 2
 
 

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Exam Preparation Worksheet for Class 12 Chemistry Unit 6 Haloalkanes and Haloarenes

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