CBSE Class 12 History (Punjabi) Question Paper 2018 with Answer Key (March 20, Set 3

CBSE Class 12 History (Punjabi) Question Paper 2018 with Answer Key Set 3 - 222/3 is available for download. The exam was conducted by the Central Board of Secondary Education on March 20, 2018 in the Morning Session 10:30 AM to 1:30 PM. The medium of paper was Punjabi. In terms of difficulty level, CBSE Class 12 History (Punjabi) paper was of Easy level. The question paper comprised a total of 17 questions divided among 2 sections.

CBSE Class 12 History (Punjabi) Set 3 - 222/3 Question Paper 2018 with Answer Key (March 20)

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CBSE Class 12 Previous Year Question Papers

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CBSE CLASS XII Questions

1.
Though chlorine shows strong $-I$ effect, why is it ortho/para directing?

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2.
Draw the structures of major products: (a) Chlorobenzene + $CH_3Cl$ / Na, dry ether
(b) p-Hydroxyphenethyl alcohol + HBr

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3.
For decomposition of $H_2O_2$ by $I^-$: Step I: $H_2O_2 + I^- \rightarrow H_2O + IO^-$ (slow). Step II: $H_2O_2 + IO^- \rightarrow H_2O + I^- + O_2$ (fast). (a) Write rate law. (b) Determine order w.r.t. $H_2O_2$ and $I^-$ and overall order. (c) Molecularity of Step II.

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4.
Predict the alkene that would be formed by dehydrohalogenation of 1-Bromo-1-methylcyclohexane.

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5.
Which isomer of $C_4H_9Br$ is most reactive towards $S_N1$ reaction?

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6.
61 g benzoic acid (M = 122 g mol$^{-1}$) dissolved in 500 g benzene. Vapour pressure of pure benzene = 66 torr. Assume complete dimerisation. Calculate vapour pressure of solution.

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CBSE Class 12 History (Punjabi) Question Paper 2018 with Answer Key (March 20, Set 3 - 222/3)

CBSE Class 12 History (Punjabi) Set 3 - 222/3 Question Paper 2018 with Answer Key (March 20)

CBSE Class 12 Previous Year Question Papers

CBSE CLASS XII Questions

1.
Though chlorine shows strong $-I$ effect, why is it ortho/para directing?

2.
Draw the structures of major products: (a) Chlorobenzene + $CH_3Cl$ / Na, dry ether
(b) p-Hydroxyphenethyl alcohol + HBr

3.
For decomposition of $H_2O_2$ by $I^-$: Step I: $H_2O_2 + I^- \rightarrow H_2O + IO^-$ (slow). Step II: $H_2O_2 + IO^- \rightarrow H_2O + I^- + O_2$ (fast). (a) Write rate law. (b) Determine order w.r.t. $H_2O_2$ and $I^-$ and overall order. (c) Molecularity of Step II.

4.
Predict the alkene that would be formed by dehydrohalogenation of 1-Bromo-1-methylcyclohexane.

5.
Which isomer of $C_4H_9Br$ is most reactive towards $S_N1$ reaction?

6.
61 g benzoic acid (M = 122 g mol$^{-1}$) dissolved in 500 g benzene. Vapour pressure of pure benzene = 66 torr. Assume complete dimerisation. Calculate vapour pressure of solution.

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CBSE Class 12 History (Punjabi) Set 3 - 222/3 Question Paper 2018 with Answer Key (March 20)

CBSE Class 12 Previous Year Question Papers

CBSE CLASS XII Questions

1.Though chlorine shows strong $-I$ effect, why is it ortho/para directing?

2.Draw the structures of major products: (a) Chlorobenzene + $CH_3Cl$ / Na, dry ether (b) p-Hydroxyphenethyl alcohol + HBr

3.For decomposition of $H_2O_2$ by $I^-$: Step I: $H_2O_2 + I^- \rightarrow H_2O + IO^-$ (slow). Step II: $H_2O_2 + IO^- \rightarrow H_2O + I^- + O_2$ (fast). (a) Write rate law. (b) Determine order w.r.t. $H_2O_2$ and $I^-$ and overall order. (c) Molecularity of Step II.

4.Predict the alkene that would be formed by dehydrohalogenation of 1-Bromo-1-methylcyclohexane.

5.Which isomer of $C_4H_9Br$ is most reactive towards $S_N1$ reaction?

6.61 g benzoic acid (M = 122 g mol$^{-1}$) dissolved in 500 g benzene. Vapour pressure of pure benzene = 66 torr. Assume complete dimerisation. Calculate vapour pressure of solution.

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1.
Though chlorine shows strong $-I$ effect, why is it ortho/para directing?

2.
Draw the structures of major products: (a) Chlorobenzene + $CH_3Cl$ / Na, dry ether
(b) p-Hydroxyphenethyl alcohol + HBr

3.
For decomposition of $H_2O_2$ by $I^-$: Step I: $H_2O_2 + I^- \rightarrow H_2O + IO^-$ (slow). Step II: $H_2O_2 + IO^- \rightarrow H_2O + I^- + O_2$ (fast). (a) Write rate law. (b) Determine order w.r.t. $H_2O_2$ and $I^-$ and overall order. (c) Molecularity of Step II.

4.
Predict the alkene that would be formed by dehydrohalogenation of 1-Bromo-1-methylcyclohexane.

5.
Which isomer of $C_4H_9Br$ is most reactive towards $S_N1$ reaction?

6.
61 g benzoic acid (M = 122 g mol$^{-1}$) dissolved in 500 g benzene. Vapour pressure of pure benzene = 66 torr. Assume complete dimerisation. Calculate vapour pressure of solution.