CBSE Class 12 History (Urdu) Question Paper 2017 with Answer Key (March 23, Set 1

CBSE Class 12 History (Urdu) Question Paper 2017 with Answer Key Set 1 - 253/1/1 is available for download. The exam was conducted by the Central Board of Secondary Education on March 23, 2017 in the Morning Session 10:30 AM to 1:30 PM. The medium of paper was Urdu. In terms of difficulty level, CBSE Class 12 History (Urdu) paper was of Easy level. The question paper comprised a total of 17 questions divided among 5 sections.

CBSE Class 12 History (Urdu) Set 1 - 253/1/1 Question Paper 2017 with Answer Key (March 23)

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CBSE CLASS XII Questions

1.
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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2.
Give structures of A, B and C: $CH_3Cl \xrightarrow{KCN}$ A $\xrightarrow{LiAlH_4}$ B $\xrightarrow{CHCl_3 + \text{alc. } KOH, \Delta}$ C

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3.
Give structures of A, B and C: Aniline $\xrightarrow{Br_2/H_2O}$ A $\xrightarrow{NaNO_2+HCl, 0-5^\circ C}$ B $\xrightarrow{H_3PO_2+H_2O}$ C

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4.
Which isomer of $C_4H_9Br$ is most reactive towards $S_N1$ reaction?

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5.
Predict the alkene formed by dehydrohalogenation of 1-Bromo-1-methylcyclohexane.

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6.
Though chlorine shows strong $-I$ effect, why is it ortho/para directing?

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CBSE Class 12 History (Urdu) Question Paper 2017 with Answer Key (March 23, Set 1 - 253/1/1)

CBSE Class 12 History (Urdu) Set 1 - 253/1/1 Question Paper 2017 with Answer Key (March 23)

CBSE Class 12 Previous Year Question Papers

CBSE CLASS XII Questions

1.
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.

2.
Give structures of A, B and C: $CH_3Cl \xrightarrow{KCN}$ A $\xrightarrow{LiAlH_4}$ B $\xrightarrow{CHCl_3 + \text{alc. } KOH, \Delta}$ C

3.
Give structures of A, B and C: Aniline $\xrightarrow{Br_2/H_2O}$ A $\xrightarrow{NaNO_2+HCl, 0-5^\circ C}$ B $\xrightarrow{H_3PO_2+H_2O}$ C

4.
Which isomer of $C_4H_9Br$ is most reactive towards $S_N1$ reaction?

5.
Predict the alkene formed by dehydrohalogenation of 1-Bromo-1-methylcyclohexane.

6.
Though chlorine shows strong $-I$ effect, why is it ortho/para directing?

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CBSE Class 12 History (Urdu) Set 1 - 253/1/1 Question Paper 2017 with Answer Key (March 23)

CBSE Class 12 Previous Year Question Papers

CBSE CLASS XII Questions

1.61 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.

2.Give structures of A, B and C: $CH_3Cl \xrightarrow{KCN}$ A $\xrightarrow{LiAlH_4}$ B $\xrightarrow{CHCl_3 + \text{alc. } KOH, \Delta}$ C

3.Give structures of A, B and C: Aniline $\xrightarrow{Br_2/H_2O}$ A $\xrightarrow{NaNO_2+HCl, 0-5^\circ C}$ B $\xrightarrow{H_3PO_2+H_2O}$ C

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

5.Predict the alkene formed by dehydrohalogenation of 1-Bromo-1-methylcyclohexane.

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

Comments

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1.
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.

2.
Give structures of A, B and C: $CH_3Cl \xrightarrow{KCN}$ A $\xrightarrow{LiAlH_4}$ B $\xrightarrow{CHCl_3 + \text{alc. } KOH, \Delta}$ C

3.
Give structures of A, B and C: Aniline $\xrightarrow{Br_2/H_2O}$ A $\xrightarrow{NaNO_2+HCl, 0-5^\circ C}$ B $\xrightarrow{H_3PO_2+H_2O}$ C

4.
Which isomer of $C_4H_9Br$ is most reactive towards $S_N1$ reaction?

5.
Predict the alkene formed by dehydrohalogenation of 1-Bromo-1-methylcyclohexane.

6.
Though chlorine shows strong $-I$ effect, why is it ortho/para directing?