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Byju's Answer
Standard XII
Chemistry
SN1 Reaction Mechanism
X is an optic...
Question

X is an optically active alkane having lowest molecular mass, predict the structure of the major product obtained on monochlorination of X.

A
CH3−CH2−CH2−CH3|C|Cl−CH2−CH3
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B
CH3−CH2−CH2−CH3|CH−C|HCl−CH3
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C
CH3−CH2−CH2−CH3|CH−CH2−CH2−Cl
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D
Cl−CH2−CH2−CH2−CH3|CH−CH2−CH3
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Solution

The correct option is C CH3−CH2−CH2−CH3|C|Cl−CH2−CH3

Halogenation usually occurs at the tertiary position of the alkanes.

The halogenation agents employed are CCl4, dichlorine monoxide, PCl5, phosgene, hypochlorite etc. in all these cases a chain initiating catalyst is required usually peroxides or UV light.

Regioselectivity of electrophillic halogenation usually takes place at the tertiary carbon atom, because tertiary carbon radical is more stable.

Option A is correct.


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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. 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)

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. IUPAC name of given compound:
CH3−CH2−CH2−CH2−CH|CH3−C|CH3−CH3−CH2−CH3|CH−CH2−CH2−CH2−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

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