Q35. Evaluate the following statements related to group 14 elements for their correctness. (A) Covalent radius decreases down the group from C to Pb in a regular manner. (B) Electronegativity decreases from C to Pb down the group gradually. (C) Maximum covalance of $\mathbf { C }$ is 4 whereas other elements can expand their covalance due to presence of d orbitals. (D) Heavier elements do not form $\mathrm { p } \pi - \mathrm { p } \pi$ bonds. (E) Carbon can exhibit negative oxidation states. Choose the correct answer from the options given below :
(1) (A), (B) and (C) Only
(2) (C), (D) and (E) Only
(3) (C) and (D) Only
(4) (A) and (B) Only

Q35. Given below are two statements: Statement I : $\mathrm { N } \left( \mathrm { CH } _ { 3 } \right) _ { 3 }$ and $\mathrm { P } \left( \mathrm { CH } _ { 3 } \right) _ { 3 }$ can act as ligands to form transition metal complexes. Statement II: As N and P are from same group, the nature of bonding of $\mathrm { N } \left( \mathrm { CH } _ { 3 } \right) _ { 3 }$ and $\mathrm { P } \left( \mathrm { CH } _ { 3 } \right) _ { 3 }$ is always same with transition metals. In the light of the above statements, choose the most appropriate answer from the options given below:
(1) Statement I is correct but Statement II is
(2) Statement I is incorrect but Statement II is incorrect. correct.
(3) Both Statement I and Statement II are correct.
(4) Both Statement I and Statement II are incorrect.

Q35. Given below are two statements : Statement (I) : A Buffer solution is the mixture of a salt and an acid or a base mixed in any particular quantities. Statement (II) : Blood is naturally occurring buffer solution whose pH is maintained by $\mathrm { H } _ { 2 } \mathrm { CO } _ { 3 } / \mathrm { HCO } _ { 3 } ^ { - } \Theta$ concentrations. In the light of the above statements, choose the correct answer from the options given below :
(1) Statement I is true but Statement II is false
(2) Both Statement I and Statement II are true
(3) Statement I is false but Statement II is true
(4) Both Statement I and Statement II are false

Q35. Methods used for purification of organic compounds are based on :
(1) nature of compound and presence of impurity.
(2) neither on nature of compound nor on the impurity present.
(3) nature of compound only. $( 4 )$ presence of impurity only.

Q36.

Correct order of basic strength of Pyrrole [Figure]
Pyridine [Figure] , and Piperidine is: [Figure]
(1) Pyrrole > Piperidine > Pyridine
(2) Pyrrole > Pyridine > Piperidine
(3) Pyridine $>$ Piperidine $>$ Pyrrole
(4) Piperidine $>$ Pyridine $>$ Pyrrole
Q37.
(A) [Figure]
(B) [Figure]
(C) [Figure]
(D) [Figure]
For the given compounds, the correct order of increasing $\mathrm { pK } _ { \mathrm { a } }$ value : [Figure] Choose the correct answer from the options given below :
(1) (B) $<$ (D) $<$ (C) $<$ (A) $<$ (E)
(2) $( \mathrm { D } ) < ( \mathrm { E } ) < ( \mathrm { C } ) < ( \mathrm { B } ) < ( \mathrm { A } )$
(3) $( \mathrm { E } ) <$ $( \mathrm { D } ) < ( \mathrm { C } ) < ( \mathrm { B } ) < ( \mathrm { A } )$
(4) $( \mathrm { E } ) < ( \mathrm { D } ) < ( \mathrm { B } ) < ( \mathrm { A } ) < ( \mathrm { C } )$

Q35. The correct increasing order for bond angles among $\mathrm { BF } _ { 3 } , \mathrm { PF } _ { 3 }$ and $\mathrm { ClF } _ { 3 }$ is :
(1) $\mathrm { BF } _ { 3 } < \mathrm { PF } _ { 3 } < \mathrm { ClF } _ { 3 }$
(2) $\mathrm { ClF } _ { 3 } < \mathrm { PF } _ { 3 } < \mathrm { BF } _ { 3 }$
(3) $\mathrm { PF } _ { 3 } < \mathrm { BF } _ { 3 } < \mathrm { ClF } _ { 3 }$
(4) $\mathrm { BF } _ { 3 } = \mathrm { PF } _ { 3 } < \mathrm { ClF } _ { 3 }$

Q36. Which of the following nitrogen containing compound does not give Lassaigne's test?
(1) Urea
(2) Phenyl hydrazine
(3) Glycene
(4) Hydrazine

Q36. The equilibrium constant for the reaction $\mathrm { SO } _ { 3 } ( \mathrm {~g} ) \rightleftharpoons \mathrm { SO } _ { 2 } ( \mathrm {~g} ) + \frac { 1 } { 2 } \mathrm { O } _ { 2 } ( \mathrm {~g} )$ is $\mathrm { K } _ { \mathrm { c } } = 4.9 \times 10 ^ { - 2 }$. The value of $\mathrm { K } _ { \mathrm { c } }$ for the reaction given below is $2 \mathrm { SO } _ { 2 } ( \mathrm {~g} ) + \mathrm { O } _ { 2 } ( \mathrm {~g} ) \rightleftharpoons 2 \mathrm { SO } _ { 3 } ( \mathrm {~g} )$ is :
(1) 4.9
(2) 49
(3) 41.6
(4) 416

Q36. The following reaction occurs in the Blast furnance where iron ore is reduced to iron metal $\mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 ( \mathrm {~s} ) } + 3 \mathrm { CO } _ { ( \mathrm { g } ) } \rightleftharpoons \mathrm { Fe } _ { ( \mathrm { l } ) } + 3 \mathrm { CO } _ { 2 ( \mathrm {~g} ) }$ Using the Le-chatelier's principle, predict which one of the following will not disturb the equilibrium.
(1) Addition of $\mathrm { CO } _ { 2 }$
(2) Removal of $\mathrm { CO } _ { 2 }$
(3) Addition of $\mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 }$
(4) Removal of CO

Q36. The correct statements from the following are : (A) The decreasing order of atomic radii of group 13 elements is $\mathrm { Tl } > \mathrm { In } > \mathrm { Ga } > \mathrm { Al } > \mathrm { B }$. (B) Down the group 13 electronegativity decreases from top to bottom. (C) Al dissolves in dil. HCl and liberates $\mathrm { H } _ { 2 }$ but conc. $\mathrm { HNO } _ { 3 }$ renders Al passive by forming a protective oxide layer on the surface. (D) All elements of group 13 exhibits highly stable + 1 oxidation state. (E) Hybridisation of Al in $\left[ \mathrm { Al } \left( \mathrm { H } _ { 2 } \mathrm { O } \right) _ { 6 } \right] ^ { 3 + }$ ion is $\mathrm { sp } ^ { 3 } \mathrm {~d} ^ { 2 }$. Choose the correct answer from the options given below :
(1) (A), (C) and (E) only
(2) (A) and (C) only
(3) (C) and (E) only
(4) (A), (B), (C) and (E) only

Q36.
Choose the correct answer Match List I with List II

	\begin{tabular}{ l } List - I
(Molecule/Species)

& &

List - II

(Property/Shape)

\hline A. & $\mathrm { SO } _ { 2 } \mathrm { Cl } _ { 2 }$ & I. & Paramagnetic \hline B. & NO & II. & Diamagnetic \hline C. & $\mathrm { NO } _ { 2 } ^ { - }$ & III. & Tetrahedral \hline D. & $\mathrm { I } _ { 3 } ^ { - }$ & IV. & Linear \hline \end{tabular}
from the options given below:
(1) A-II, B-III, C-I, D-IV
(2) A-III, B-I, C-II, D-IV
(3) A-IV, B-I, C-III, D-II
(4) A-III, B-IV, C-II, D-I

Q36. The correct statement among the following, for a "chromatography" purification method is :
(1) Organic compounds run faster than solvent in the (2) $R _ { f }$ is an integral value. thin layer chromatographic plate.
(3) $\mathrm { R } _ { f }$ of a polar compound is smaller than that of a (4) Non-polar compounds are retained at top and non-polar compound. non-polar compound. polar compounds come down in column chromatography.

Q36. For the given hypothetical reactions, the equilibrium constants are as follows :
$$\mathrm { X } \rightleftharpoons \mathrm { Y } ; \mathrm { K } _ { 1 } = 1.0$$
equilibrium constant for the reaction $\mathrm { X } \rightleftharpoons \mathrm { W }$ is
(1) 6.0
(2) 12.0
(3) 7.0
(4) 8.0

Q36. The correct sequence of acidic strength of the following aliphatic acids in their decreasing order is: $\mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { COOH } , \mathrm { CH } _ { 3 } \mathrm { COOH } , \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { COOH } , \mathrm { HCOOH }$
(1) $\mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { COOH } > \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { COOH } > \mathrm { CH } _ { 3 } \mathrm { COOH } > \mathrm { HCOOH }$
(2) $\mathrm { CH } _ { 3 } \mathrm { COOH } > \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { COOH } > \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { COOH } > \mathrm { HCOOH }$
(3) $\mathrm { HCOOH } > \mathrm { CH } _ { 3 } \mathrm { COOH } > \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { COOH } > \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { COOH }$
(4) $\mathrm { HCOOH } > \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { COOH } > \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { COOH } > \mathrm { CH } _ { 3 } \mathrm { COOH }$
Q37. IUPAC name of following hydrocarbon $( X )$ is : [Figure]
(1) 2-Ethyl-3,6-dimethylheptane
(2) 2,5,6-Trimethyloctane
(3) 3,4,7-Trimethyloctane
(4) 2-Ethyl-2,6-diethylheptane

Q36. The incorrect statement regarding ethyne is
(1) The $\mathbf { C } - \mathbf { C }$ bonds in ethyne is shorter than that in (2) Both carbons are sp hybridised ethene
(3) Ethyne is linear
(4) The corbon - carbon bonds in ethyne is weaker than that in ethene

Q37. Which among the following is incorrect statement?
(1) Electromeric effect dominates over inductive effect
(2) The electromeric effect is, temporary effect
(3) Hydrogen ion $\left( \mathrm { H } ^ { + } \right)$shows negative electromeric effect
(4) The organic compound shows electromeric effect in the presence of the reagent only.
Q38. [Figure]
Identify (B) and (C) and how are (A) and (C) related ?
(1) [Figure] [Figure] ; functional group isomers
(2) [Figure] [Figure] ; chain isomers
(3) [Figure] [Figure] ; positon isomers
(4) [Figure] [Figure]

Q37.
[Figure]
a
[Figure]
b
[Figure]
c
[Figure]
d
Correct order of stability of carbanion is -
(1) $d > a > c > b$
(2) $\mathrm { a } > \mathrm { b } > \mathrm { c } > \mathrm { d }$
(3) $d > c > b > a$
(4) $c > b > d >$ a

Q37. The number of neutrons present in the more abundant isotope of boron is ' $x$ '. Amorphous boron upon heating with air forms a product, in which the oxidation state of boron is ' $y$ '. The value of $x + y$ is $\_\_\_\_$
(1) 3
(2) 9
(3) 4
(4) 6

Q37. The correct nomenclature for the following compound is : [Figure]
(1) 2-formyl-4-hydroxyhept-7-enoic acid
(2) 2-formyl-4-hydroxyhept-6-enoic acid
(3) 2-carboxy-4-hydroxyhept-7-enal
(4) 2-carboxy-4-hydroxyhept-6-enal

Q37. At $- 20 ^ { \circ } \mathrm { C }$ and 1 atm pressure, a cylinder is filled with equal number of $\mathrm { H } _ { 2 } , \mathrm { I } _ { 2 }$ and HI molecules for the reaction $\mathrm { H } _ { 2 } ( \mathrm {~g} ) + \mathrm { I } _ { 2 } ( \mathrm {~g} ) \rightleftharpoons 2 \mathrm { HI } ( \mathrm { g } )$, the $\mathrm { K } _ { \mathrm { p } }$ for the process is $x \times 10 ^ { - 1 } \cdot \mathrm { x } =$ [Given : $\mathrm { R } = 0.082 \mathrm {~L} \mathrm {~atm} \mathrm {~K} ^ { - 1 } \mathrm {~mol} ^ { - 1 }$ ]
(1) 0.01
(2) 10
(3) 2
(4) 1

Q37. The incorrect statement regarding the geometrical isomers of 2-butene is :
(1) cis-2-butene and trans-2-butene are not
(2) cis-2-butene and trans-2-butene are interconvertible at room temperature. stereoisomers.
(3) cis-2-butene has less dipole moment than trans-2-(4) trans-2-butene is more stable than cis-2-butene. butene.

Q37. Among the following halogens $\mathrm { F } _ { 2 } , \mathrm { Cl } _ { 2 } , \mathrm { Br } _ { 2 }$ and $\mathrm { I } _ { 2 }$ Which can undergo disproportionation reactions?
(1) $\mathrm { F } _ { 2 } , \mathrm { Cl } _ { 2 }$ and $\mathrm { Br } _ { 2 }$
(2) $\mathrm { F } _ { 2 }$ and $\mathrm { Cl } _ { 2 }$
(3) Only $\mathrm { I } _ { 2 }$
(4) $\mathrm { Cl } _ { 2 } , \mathrm { Br } _ { 2 }$ and $\mathrm { I } _ { 2 }$

Q37. For a sparingly soluble salt $\mathrm { AB } _ { 2 }$, the equilibrium concentrations of $\mathrm { A } ^ { 2 + }$ ions and $B ^ { - }$ions are $1.2 \times 10 ^ { - 4 } \mathrm { M }$ and $0.24 \times 10 ^ { - 3 } \mathrm { M }$, respectively. The solubility product of $\mathrm { AB } _ { 2 }$ is :
(1) $6.91 \times 10 ^ { - 12 }$
(2) $0.276 \times 10 ^ { - 12 }$
(3) $27.65 \times 10 ^ { - 12 }$
(4) $0.069 \times 10 ^ { - 12 }$

Q38. Common name of Benzene - 1, 2 - diol is -
(1) catechol
(2) o-cresol
(3) quinol
(4) resorcinol

Q38. Number of $\sigma$ and $\pi$ bonds present in ethylene molecule is respectively :
(1) 4 and 1
(2) 5 and 2
(3) 3 and 1
(4) 5 and 1

Q38.

List - I (Pair of compounds)

Match List I with List II

List - II

(Isomerism) (I) Metamerism (II) Chain Isomerism (III) Position Isomerism (IV) Functional Isomerism correct answer from the options given below :
(1) (A)-(II), (B)-(I), (C)-(IV), (D)-(III)
(2) (A)-(III), (B)-(I), (C)-(II), (D)-(IV)
(3) (A)-(I), (B)-(III), (C)-(IV), (D)-(II)
(4) (A)-(III), (B)-(I), (C)-(IV), (D)-(II)