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Byju's Answer
Standard XII
Chemistry
Introduction to E2 Mechanism
Which of the ...
Question

Which of the following applies in the reaction?


CH3CH(Br)CH2CH3Alc.KOH−−−−−−→ ?

(I) CH3CH=CH−CH3 (major product)
(II) CH2=CHCH2CH3 (minor product)

A
Hofmann's rule
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B
Saytzeff's rule
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C
Kharasch effect
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D
Markovnikov’s rule
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Solution

The correct option is B Saytzeff's rule

This reaction is governed by Saytzeff's rule. According to this rule, the elimination of β-hydrogen atom takes place from the carbon having the less number of H-atoms or in other words, a stable alkene is formed (More substituted alkene is more stable)
707974_643945_ans_8de374f2726c4770a90cbd78d679be41.png

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Q. The major product (x) of the following reaction is:

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. 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. 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. 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
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