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Byju's Answer
Standard XII
Chemistry
Cross Aldol Condensation
Cl-CH2- CH3...
Question

Cl−CH2−CH3|C|CH3−CH2−CH2−Cl+I−−−−→DMF product;

A
I−CH2−CH3|C|CH3−CH2−CH2−Cl
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B
Cl−CH2−CH3|C|CH3−CH2−CH2−I
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C
H2C=CH3|C−CH2−CH2=Cl
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D
ClCH2−CH3|C|CH3−CH2=CH2
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Solution

The correct option is B Cl−CH2−CH3|C|CH3−CH2−CH2−I
CH3 CH3
Cl−CH2−|C|−CH2−CH2−Cl+I−DMF−−−→Cl−CH2−|C|−CH2−CH2−I
CH3 CH3
DMF is dimethylformamide. It ia an organic compound with formula of (CH3)2NCH. DMF is a polar aprotic solvent with a high boiling point and facilitates reactions that follow polar mechanisms, such as SN2 .

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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
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.
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:
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