General Organic Chemistry & Isomerism · JEE Main previous year questions

1. A.d, b, a, c
2. B.b, c, a, d
3. C.c, a, b, d
4. D.d, b, c, a

If $\mathrm{N}{\mathrm{i}}^{2+}$ is replaced by $\mathrm{P}{\mathrm{t}}^{2+}$ in the complex $[\mathrm{NiC}{\mathrm{l}}_2\mathrm{B}{\mathrm{r}}_2{]}^{2-}$, which of the following properties are expected to get changed ? A. Geometry B. Geometrical isomerism C. Optical isomerism D. Magnetic properties

1. A.A and D
2. B.A, B and D
3. C.A, B and C
4. D.B and C

The number of possible isomeric products formed when 3-chloro-1-butene reacts with $\mathrm{HCl}$ through carbocation formation is _________.

Using column chromatography, mixture of two compounds 'A' and 'B' was separated. 'A' eluted first, this indicates 'B' has

1. A.high ${\text{R}}_{\text{f}}$, weaker adsorption
2. B.high ${\text{R}}_{\text{f}}$, stronger adsorption
3. C.low ${\text{R}}_{\text{f}}$, weaker adsorption
4. D.low ${\text{R}}_{\text{f}}$, stronger adsorption

In Carius tube, an organic compound 'X' is treated with sodium peroxide to form a mineral acid 'Y'. The solution of ${\text{BaCl}}_2$ is added to 'Y' to form a precipitate 'Z'. 'Z' is used for the quantitative estimation of an extra element. 'X' could be

1. A.Cytosine
2. B.Methionine
3. C.Chloroxylenol
4. D.A nucleotide

$0.5\text{ g}$ of an organic compound (X) with $60\%$ carbon will produce ___________ $\times 10^{-1}\text{ g}$ of $\mathrm{C}{\mathrm{O}}_2$ on complete combustion.

1. A.It is possible to identify each structure individually by some physical or chemical method.
2. B.All these structures are in dynamic equilibrium with each other.
3. C.Each structure exists for equal amount of time.
4. D.${\text{CO}}_3^{2-}$ has a single structure i.e., resonance hybrid of the above three structures.

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

Choose the correct set of reagents for the following conversion. $\text{trans }(\mathrm{Ph}-\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}}_3)\to \text{cis }(\mathrm{Ph}-\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}}_3)$

1. A.${\mathrm{Br}}_2,\text{alc}\cdot \mathrm{KOH},{\mathrm{NaNH}}_2,{\mathrm{H}}_2\text{ Lindlar Catalyst}$
2. B.${\mathrm{Br}}_2,\text{aq}\cdot \mathrm{KOH},{\mathrm{NaNH}}_2,\mathrm{Na}(\text{Liq }{\mathrm{NH}}_3)$
3. C.${\mathrm{Br}}_2,\text{alc}\cdot \mathrm{KOH},{\mathrm{NaNH}}_2,\mathrm{Na}(\text{Liq }{\mathrm{NH}}_3)$
4. D.${\mathrm{Br}}_2,\text{aq}\cdot \mathrm{KOH},{\mathrm{NaNH}}_2,{\mathrm{H}}_2\text{ Lindlar Catalyst}$

On complete combustion, $0.492\text{ g}$ of an organic compound gave $0.792\text{ g}$ of ${\mathrm{CO}}_2$. The $\%$ of carbon in the organic compound is ___________ (Nearest integer)

1. A.
2. B.
3. C.
4. D.

In Dumas method for the estimation of ${\mathrm{N}}_2$, the sample is heated with copper oxide and the gas evolved is passed over :

1. A.Copper oxide
2. B.Copper gauze
3. C.$\mathrm{Pd}$
4. D.$\mathrm{Ni}$

The element playing significant role in neuromuscular function and interneuronal transmission is :

1. A.$\mathrm{Be}$
2. B.$\mathrm{Ca}$
3. C.$\mathrm{Mg}$
4. D.$\mathrm{Li}$

When $0.01\mathrm{mol}$ of an organic compound containing $60\%$ carbon was burnt completely, $4.4\mathrm{g}$ of $\mathrm{C}{\mathrm{O}}_2$ was produced. The molar mass of compound is ____ $\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$ (Nearest integer).

1. A.
2. B.
3. C.
4. D.

1. A.
2. B.
3. C.
4. D.

The isomeric deuterated bromide with molecular formula ${\mathrm{C}}_4{\mathrm{H}}_8\mathrm{DBr}$ having two chiral carbon atoms is

1. A.2 - Bromo - 1 - deuterobutane
2. B.2 - Bromo - 1 - deutero - 2 - methylpropane
3. C.2 - Bromo - 3 - deuterobutane
4. D.2 - Bromo - 2 - deuterobutane

1. A.D, C, B, A
2. B.C, D, B, A
3. C.C, A, B, D
4. D.D, C, A, B

Given below are two statements: Statement I : Noradrenaline is a neurotransmitter. Statement II : Low level of noradrenaline is not the cause of depression in human. In the light of the above statements, choose the correct answer from the options given below

1. A.Both Statement I and Statement II are incorrect
2. B.Statement I is correct but Statement II is incorrect
3. C.Both Statement I and Statement II are correct
4. D.Statement I is incorrect but Statement II is correct

Maximum number of isomeric monochloro derivatives which can be obtained from 2,2,5,5- tetramethylhexane by chlorination is _____________

1. A.
2. B.
3. C.
4. D.

1. A.Both Statement I and Statement II are correct.
2. B.Both Statement I and Statement II are incorrect.
3. C.Statement I is correct but Statement II is incorrect.
4. D.Statement I is incorrect but Statement II is correct.

1. A.(A) - (II), (B) - (I), (C) - (IV), (D) - (III)
2. B.(A) - (IV), (B) - (III), (C) - (I), (D) - (II)
3. C.(A) - (III), (B) - (IV), (C) - (I), (D) - (II)
4. D.(A) - (IV), (B) - (III), (C) - (II), (D) - (I)