Organic Reactions & Conversions — JEE Main Previous Year Questions · PaperYodha

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Organic Reactions & Conversions · JEE Main previous year questions

262 questions asked across 15 exam years, newest first

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2020 25 questions

Q562020 · 6 Sept 2020 · Shift 1
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4. D.
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Answer: D
Q572020 · 6 Sept 2020 · Shift 1
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Answer: A
Q602020 · 6 Sept 2020 · Shift 1
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Answer: C
Q592020 · 3 Sept 2020 · Shift 2
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Answer: A
Q622020 · 3 Sept 2020 · Shift 2
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Answer: D
Q552020 · 2 Sept 2020 · Shift 1
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Answer: C
Q522020 · 2 Sept 2020 · Shift 2
1. A.Changing the concentration of base will have no effect on reaction (1)
2. B.Changing the concentration of base will have no effect on reaction (2)
3. C.Changing the base from $O H^{-}$ to $^{-} OR$ will have no effect on reaction (2)
4. D.Doubling the concentration of base will double the rate of both the reactions
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Answer: A
Q612020 · 2 Sept 2020 · Shift 2
The results given in the below table were obtained during kinetic studies of the following reaction $2 A + B \to C + D$ | Experiment | $[A] / mol L^{- 1}$ | $[B] / mol L^{- 1}$ | Initial rate $/ mol L^{- 1} mi n^{- 1}$ | | :--- | :--- | :--- | :--- | | I | 0.1 | 0.1 | $6.00 \times 1 0^{- 3}$ | | II | 0.1 | 0.2 | $2.40 \times 1 0^{- 2}$ | | III | 0.2 | 0.1 | $1.20 \times 1 0^{- 2}$ | | IV | X | 0.2 | $7.20 \times 1 0^{- 2}$ | | V | 0.3 | Y | $2.88 \times 1 0^{- 1}$ | X and Y in the given table are respectively :
1. A.0.3, 0.4
2. B.0.4, 0.3
3. C.0.4, 0.4
4. D.0.3, 0.3
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Answer: A
Q662020 · 2 Sept 2020 · Shift 2
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Answer: C
Q672020 · 2 Sept 2020 · Shift 2
The correct observation in the following reactions is : $Sucrose Glycosidic bond Cleavage (Hydrolysis) A + B Seliwanoff’s reagent ?$
1. A.Formation of blue colour
2. B.Formation of violet colour
3. C.Formation of red colour
4. D.Gives no colour
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Answer: C
Q612020 · 9 Jan 2020 · Shift 1
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Answer: A
Q632020 · 9 Jan 2020 · Shift 1
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Answer: D
Q532020 · 9 Jan 2020 · Shift 2
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Answer: C
Q542020 · 9 Jan 2020 · Shift 2
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Answer: B
Q552020 · 8 Jan 2020 · Shift 1
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Answer: C
Q562020 · 8 Jan 2020 · Shift 1
1. A. $LiAl H_{4}$
2. B. $B_{2} H_{6}$
3. C. $NaB H_{4}$
4. D. $H_{2} /Pd$
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Answer: B
Q592020 · 8 Jan 2020 · Shift 1
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Answer: B
Q562020 · 8 Jan 2020 · Shift 2
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Answer: C
Q632020 · 8 Jan 2020 · Shift 2
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Answer: D
Q642020 · 7 Jan 2020 · Shift 1
Consider the following reaction : (a) $(C H_{3})_{3} C C H (O H) C H_{3} conc. H_{2} S O_{4}$ (b) $(C H_{3})_{2} C H C H (B r) C H_{3} alc. K O H$ (c) $(C H_{3})_{2} C H C H (B r) C H_{3} (C H_{3})_{3} O^{⊖} K^{\oplus}$ (d) $(C H_{3})_{2} C (O H) - C H_{2} - C H O Δ$ Which of these reaction(s) will not produce Saytzeff product ?
1. A.(d) only
2. B.(b) and (d)
3. C.(a), (c) and (d)
4. D.(c) only
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Answer: D
Q672020 · 7 Jan 2020 · Shift 1
1. A.as food grade colourant
2. B.in acid base titration as an indicatior.
3. C.in laboratory test for phenols
4. D.in protein estimation as an alternative to ninhydrin.
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Answer: B
Q512020 · 7 Jan 2020 · Shift 2
1. A.(b), (c) and (d)
2. B.(a) and (b)
3. C.(a) and (d)
4. D.(b) and (d)
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Answer: D
Q642020 · 7 Jan 2020 · Shift 2
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Answer: B
Q672020 · 7 Jan 2020 · Shift 2
In the following reaction, products (A) and (B) respectively, are : $NaOH + C l_{2} \to (A) + side products (hot and conc.)$ $Ca (OH)_{2} + C l_{2} \to (B) + side products (dry)$
1. A. $NaOCl$ and $Ca (OCl)_{2}$
2. B. $NaCl O_{3}$ and $Ca (Cl O_{3})_{2}$
3. C. $NaOCl$ and $Ca (Cl O_{3})_{2}$
4. D. $NaCl O_{3}$ and $Ca (OCl)_{2}$
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Answer: D
Q722020 · 7 Jan 2020 · Shift 2· Numerical answer
Consider the following reactions : $NaCl + K_{2} C r_{2} O_{7} + (conc.) H_{2} S O_{4} \to (A) + side products$ $(A) + NaOH \to (B) + Side products$ $(B) + (dilute) H_{2} S O_{4} + H_{2} O_{2} \to (C) + Side products$ The sum of the total number of atoms in one molecule each of (A) and (B) and (C) is
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Answer: 18