1. A
   $CH_3-F < CH_3-Cl < CH_3-Br < CH_3-I$
2. B
   $CH_3-F > CH_3-Cl > CH_3-Br > CH_3-I$
3. C
   $CH_3-F < CH_3-Cl > CH_3-Br > CH_3-I$
4. D
   $CH_3-Cl > CH_3-F > CH_3-Br > CH_3-I$

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1. A
   CH
2. B
   $CH_2$
3. C
   $CH_3$
4. D
   $CH_4$

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1. A
   Calcium chloride
2. B
   Strontium chloride
3. C
   Magnesium chloride
4. D
   Beryllium chloride

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1. A
   $sp^3$ and 4
2. B
   $sp^3$ and 6
3. C
   $sp^2$ and 6
4. D
   $sp^2$ and 8

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1. A
   8.50
2. B
   5.50
3. C
   7.75
4. D
   6.25

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1. A
   P vs V: three rectangular hyperbola (decreasing) curves; labelled 200 K, 400 K, 600 K from top to bottom
2. B
   P vs V: single horizontal straight line labelled (200 K, 400 K, 600 K)
3. C
   P vs V: three straight lines through origin with increasing slope; labelled 200 K, 400 K, 600 K
4. D
   P vs V: three rectangular hyperbola (decreasing) curves; labelled 600 K, 400 K, 200 K from top to bottom

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1. A
   PE vs Reaction Progress: A and B at nearly the same low level with a tall symmetric barrier
2. B
   PE vs Reaction Progress: A on the left at moderate height, small barrier, B on the right at a lower level (exothermic)
3. C
   PE vs Reaction Progress: A and B at the same level with a symmetric barrier (thermoneutral)
4. D
   PE vs Reaction Progress: A on the left at a low level, barrier, B on the right at a higher level (endothermic)

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1. A
   $C_5H_{12}$
2. B
   $C_3H_8O$
3. C
   $C_3H_6O$
4. D
   $C_4H_{10}O$

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1. A
   Belonging to same group
2. B
   Diagonal relationship
3. C
   Lanthanoid contraction
4. D
   Having similar chemical properties

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1. A
   (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
2. B
   (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
3. C
   (a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
4. D
   (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)

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1. A
   $H_2O$
2. B
   $CH_3CH_2OH$
3. C
   HI
4. D
   CuCN/KCN

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1. A
   $O^{2-}, F^-$
2. B
   $Na^+, Mg^{2+}$
3. C
   $Mn^{2+}, Fe^{3+}$
4. D
   $Fe^{2+}, Mn^{2+}$

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1. A
   $41.5 \; kJ \; mol^{-1}$
2. B
   $83.0 \; kJ \; mol^{-1}$
3. C
   $166 \; kJ \; mol^{-1}$
4. D
   $-83 \; kJ \; mol^{-1}$

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1. A
   $\Delta U = 0, \Delta S_{total} = 0$
2. B
   $\Delta U \neq 0, \Delta S_{total} \neq 0$
3. C
   $\Delta U = 0, \Delta S_{total} \neq 0$
4. D
   $\Delta U \neq 0, \Delta S_{total} = 0$

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1. A
   $HF < HCl < HBr < HI$ : Increasing acidic strength
2. B
   $H_2O < H_2S < H_2Se < H_2Te$ : Increasing $pK_a$ values
3. C
   $NH_3 < PH_3 < AsH_3 < SbH_3$ : Increasing acidic character
4. D
   $CO_2 < SiO_2 < SnO_2 < PbO_2$ : Increasing oxidizing power

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1. A
   $C_6H_5-CH(OCrOHCl_2)_2$
2. B
   $C_6H_5-CH(OCOCH_3)_2$
3. C
   $C_6H_5-CHCl_2$
4. D
   $C_6H_5-CHClH$

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1. A
   160 mm of Hg
2. B
   168 mm of Hg
3. C
   336 mm of Hg
4. D
   350 mm of Hg

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1. A
   $1.75\times 10^{-4} \; mol \; L^{-1}$
2. B
   $2.50\times 10^{-4} \; mol \; L^{-1}$
3. C
   $1.75\times 10^{-5} \; mol \; L^{-1}$
4. D
   $2.50\times 10^{-5} \; mol \; L^{-1}$

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1. A
   $B_2H_6$
2. B
   Red Phosphorus
3. C
   CaO
4. D
   DIBAL-H

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1. A
   (a) - (iv), (b) - (i), (c) - (ii), (d) - (iii)
2. B
   (a) - (iii), (b) - (ii), (c) - (i), (d) - (iv)
3. C
   (a) - (i), (b) - (iv), (c) - (iii), (d) - (ii)
4. D
   (a) - (ii), (b) - (iii), (c) - (iv), (d) - (i)

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1. A
   Structure (1)
2. B
   Structure (2)
3. C
   Structure (3)
4. D
   Structure (4)

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1. A
   $POCl_3$
2. B
   $CH_2O$
3. C
   $SbCl_5$
4. D
   $NO_2$

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1. A
   (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
2. B
   (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
3. C
   (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
4. D
   (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)

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1. A
   2.518
2. B
   2.602
3. C
   25.18
4. D
   26.02

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1. A
   $Carica\ papaya$
2. B
   $Chara$
3. C
   $Marchantia\ polymorpha$
4. D
   $Cycas\ circinalis$

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