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Standard XII
Chemistry
Electrophilic Substitution Reactions of Haloarenes
Complete the ...
Question

Complete the following chemical reactions
(b) CH3−CH2−Cl+KCNΔ−→
(c) CH3−CH=CH2+HI→
(d) CH3−CH2−OH+NaBr+H2SO4→
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Solution

(a) Chlorobenzene reacts with methyl chloride in presence of anhydrous aluminium chloride to give mixture of 1−chloro−4−methylbenzene (major) and 1−chloro−2−methylbenzene (minor)
(b) Ethyl chloride reacts with potassium cyanide to form ethyl cyanide.
CH3−CH2−Cl+KCNΔ−→CH3−CH2−CN+KCl
(c) A molecule of HI is added to double bond of propene to form 2−iodopropane . Addition follows Markownikoff's rule.
CH3−CH=CH2+HI→CH3−CH(I)−CH3
(d) In presence of sulphuric acid, ethanol reacts with NaBr to form ethyl bromide.
CH3−CH2−OH+NaBr+12H2SO4→CH3−CH2−Br+H2O+12Na2SO4
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Q. Identify the type of the following reaction of carbon compounds.
a. CH3 -CH2 -CH2-OH → CH3 -CH2 -COOH
b. CH3 -CH2 -CH3 → 3CO2 + 4H2O
c. CH3 -CH = CH -CH3 + Br2 → CH3 -CHBr - CHBr -CH3
d. CH3 -CH3 + Cl2 → CH3 -CH2 -Cl + HCl
e. CH3 -CH2 -CH2 -CH2 -OH → CH3 -CH2 -CH=CH2 + H2O
f. CH3 -CH2 -COOH + NaOH → CH3 -CH2 -COO - Na+ + H2O
g. CH3 -COOH + CH3 -OH → CH3 -COO- CH3 + H2O
Q. Pick out the correct reactions:
A. CH3−CH=CH2+HCl⟶CH3−C|ClH−CH3
B. CH3−CH=CH2+HBr⟶CH3−CH2−CH2Br
C. CH3−CH=CH2+HBrperoxide−−−−−→CH3−CH2−CH2−Br
D. CH3−CH=CH2+HIperoxide−−−−−→CH3−C|IH−CH3
Q. Which of the following reaction is example of SN2 reaction using conc. HCl:
(a) CH3−CH2−OHAnhyZnCl2/△−−−−−−−−−→CH3−CH2−Cl

(b) CH3−CH3|C|CH3−CH2OHAnhyZnCl2/△−−−−−−−−−→CH3−CH1|C|CH3−CH2−CH3

(c) CH3−OH|C|CH3−CH3AnhyZnCl2/△−−−−−−−−−→CH3−Cl|C|CH3−CH3

(d) CH2=CH−CH2−OHAnhyZnCl2/△−−−−−−−−−→CH2=CH−CH2−Cl

Q.
A) CH3−CH2−⊕CH2
B) CH3−CH|F−⊕CH2
C) CH3−CH|Br−⊕CH2
D) CH3−CH|Cl−⊕CH2
Arrange the following carbocations in decreasing order of their stability:
Q. Select the member of each pair that shows faster rate of SN2 reaction with KI in acetone.

(a) CH3−CH2−CH2−CH2−ClandCH3−CH∣CH3−CH2−Cl
(I)(II)
(b) CH3−CH2−CH2−ClandCH3−CH2−CH2−Br
(I)(II)
(c) CH3−CH∣CH3−CH2−CH2−ClandCH3−CH3∣C∣CH3−CH2Cl
(I)(II)
(d) CH3−CH2−CH2−Br∣CH−CH3andCH3−CH3∣CH−CH2−Br∣CH−CH3
(I)(II)

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