Organic Reactions & Conversions · JEE Main previous year questions

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

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

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

The major product in the following conversion is – $$\mathrm{C}{\mathrm{H}}_3\mathrm{O}-{\mathrm{C}}_6{\mathrm{H}}_4-\mathrm{CH}=\mathrm{CH}-\mathrm{C}{\mathrm{H}}_3\underset{\text{Heat}}{\overset{\mathrm{HBr}\text{ (excess)}}{\to }}?$$ (para-substituted benzene)

1. A.$\mathrm{HO}-{\mathrm{C}}_6{\mathrm{H}}_4-\mathrm{C}{\mathrm{H}}_2-\mathrm{CH}(\mathrm{Br})-\mathrm{C}{\mathrm{H}}_3$ (para)
2. B.$\mathrm{C}{\mathrm{H}}_3\mathrm{O}-{\mathrm{C}}_6{\mathrm{H}}_4-\mathrm{C}{\mathrm{H}}_2-\mathrm{CH}(\mathrm{Br})-\mathrm{C}{\mathrm{H}}_3$ (para)
3. C.$\mathrm{C}{\mathrm{H}}_3\mathrm{O}-{\mathrm{C}}_6{\mathrm{H}}_4-\mathrm{CH}(\mathrm{Br})-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}{\mathrm{H}}_3$ (para)
4. D.$\mathrm{HO}-{\mathrm{C}}_6{\mathrm{H}}_4-\mathrm{CH}(\mathrm{Br})-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}{\mathrm{H}}_3$ (para)

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

The major product of the following reaction is : $$\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{CH}(\mathrm{Br})-\mathrm{C}{\mathrm{H}}_2\mathrm{Br}\underset{\text{(ii) }\mathrm{NaN}{\mathrm{H}}_2\text{ in liq. }\mathrm{N}{\mathrm{H}}_3}{\overset{\text{(i) KOH alc}}{\to }}$$

1. A.$\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{C}\equiv \mathrm{CH}$
2. B.$\mathrm{C}{\mathrm{H}}_3\mathrm{CH}=\mathrm{C}=\mathrm{C}{\mathrm{H}}_2$
3. C.$\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{CH}(\mathrm{N}{\mathrm{H}}_2)-\mathrm{C}{\mathrm{H}}_2\mathrm{N}{\mathrm{H}}_2$
4. D.$\mathrm{C}{\mathrm{H}}_3\mathrm{CH}=\mathrm{CHC}{\mathrm{H}}_2\mathrm{N}{\mathrm{H}}_2$

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

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

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

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

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

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

1. A.A = Benzyl alcohol, B = Benzyl cyanide
2. B.A = Benzyl chloride, B = Benzyl cyanide
3. C.A = Benzyl alcohol, B = Benzyl isocyanide
4. D.A = Benzyl chloride, B = Benzyl isocyanide

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

The major product of following reaction is : $$\mathrm{R}-\mathrm{C}\equiv \mathrm{N}\underset{\text{(2) }{\mathrm{H}}_2\mathrm{O}}{\overset{\text{(1) }\mathrm{AlH}(\mathrm{i}\text{-}\mathrm{Bu}{)}_2}{\to }}$$

1. A.$\mathrm{RCOOH}$
2. B.$\mathrm{RCON}{\mathrm{H}}_2$
3. C.$\mathrm{RCHO}$
4. D.$\mathrm{RC}{\mathrm{H}}_2\mathrm{N}{\mathrm{H}}_2$

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

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

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

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

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

In which of the following reactions, an increase in the volume of the container will favour the formation of products?

1. A.$2{\text{NO}}_2(\text{g})\rightleftharpoons 2\text{NO}(\text{g})+{\text{O}}_2(\text{g})$
2. B.${\text{H}}_2(\text{g})+{\text{I}}_2(\text{g})\rightleftharpoons 2\text{HI}(\text{g})$
3. C.$4{\text{NH}}_3(\text{g})+5{\text{O}}_2(\text{g})\rightleftharpoons 4\text{NO}(\text{g})+6{\text{H}}_2\text{O}(\text{l})$
4. D.$3{\text{O}}_2(\text{g})\rightleftharpoons 2{\text{O}}_3(\text{g})$

For which of the following reactions, $\Delta \text{H}$ is equal to $\Delta \text{U}$?

1. A.${\text{N}}_2(\text{g})+3{\text{H}}_2(\text{g})\to 2{\text{NH}}_3(\text{g})$
2. B.$2\text{HI}(\text{g})\to {\text{H}}_2(\text{g})+{\text{I}}_2(\text{g})$
3. C.$2{\text{NO}}_2(\text{g})\to {\text{N}}_2{\text{O}}_4(\text{g})$
4. D.$2{\text{SO}}_2(\text{g})+{\text{O}}_2(\text{g})\to 2{\text{SO}}_3(\text{g})$

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

1. A.(i) ${\text{B}}_2{\text{H}}_6$; (ii) ${\text{SnCl}}_2/\text{HCl}$; (iii) ${\text{H}}_3{\text{O}}^{+}$
2. B.(i) ${\text{LiAlH}}_4$; (ii) ${\text{H}}_3{\text{O}}^{+}$
3. C.(i) ${\text{B}}_2{\text{H}}_6$; (ii) DIBALH; (iii) ${\text{H}}_3{\text{O}}^{+}$
4. D.(i) ${\text{NaBH}}_4$; (ii) Raney ${\text{Ni/H}}_2$; (iii) ${\text{H}}_3{\text{O}}^{+}$

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