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Standard XII
Chemistry
Valency and Oxidation State
Find the oxid...
Question

Find the oxidation and reduction process for the following reaction:
CH2=CH2+H2→CH3−CH3

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Solution


Oxidation state of C in C2H4=−2
Oxidation state of H in H2=0
Oxidation state of H in C2H6=+1
Oxidation state of C in C2H6=−3
Therefore, oxidation process : CH2=CH2→CH3−CH3
Reduction process : H2→CH3−CH3

1054072_1070976_ans_3069fa9a4b304a529909b59b9ec2a614.jpg

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Q. Explain the mechanism of the following reaction:
CH3−CH2−OHH+−−→443KCH2=CH2+H−2O
Q. Match the column A,B and C suitably.
Reactabts (A)Products (B)Name of the reaction (C)
CH3−CH3+Cl2CO2+H2OAddition reaction
C2H6+O2CH2=CH2Thermal cracking
nCH2=CH2CH2=CH2+CH4Substitution reactions
CH3−CH2−CH3CH3−CH2Cl+HClPolymerisation
CH≡CH+H2[−CH2−CH2−]nCombustion
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. 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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