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

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Organic Reactions & Conversions · JEE Main previous year questions

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2021 27 questions

Q642021 · 26 Aug 2021 · Shift 2
Match List - I with List - II : | List - I (Chemical Reaction) | List - II (Reagent used) | | :--- | :--- | | (a) $C H_{3} COOC H_{2} C H_{3} \to C H_{3} C H_{2} OH$ | (i) $C H_{3} MgBr/ H_{3} O^{+}$ (1 equivalent) | | (b) $C H_{3} COOC H_{3} \to C H_{3} CHO$ | (ii) $H_{2} S O_{4} / H_{2} O$ | | (c) $C H_{3} C \equiv N \to C H_{3} CHO$ | (iii) $DIBAL - H/ H_{2} O$ | | (d) $C H_{3} C \equiv N \to C H_{3} COC H_{3}$ | (iv) $SnC l_{2}, HCl/ H_{2} O$ | Choose the most appropriate match :
1. A.a-ii, b-iv, c-iii, d-i
2. B.a-iv, b-ii, c-iii, d-i
3. C.a-ii, b-iii, c-iv, d-i
4. D.a-iii, b-ii, c-i, d-iv
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Answer: C
Q702021 · 26 Aug 2021 · Shift 2
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Answer: C
Q712021 · 26 Aug 2021 · Shift 2
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Answer: C
Q612021 · 27 Jul 2021 · Shift 2
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Answer: B
Q702021 · 27 Jul 2021 · Shift 2
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Answer: D
Q642021 · 25 Jul 2021 · Shift 1
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Answer: D
Q722021 · 25 Jul 2021 · Shift 2
$Br - C H_{2} - CHO EtOH excess dry HCl gas$ "A" (major product) $^{t} Bu O^{-} K^{+}$ "B" (major product) [where $H_{2} C = C (OEt)_{2}$ ] Consider the above reaction sequence, Product "A" and Product "B" formed respectively are :
1. A. $Br - C H_{2} - CH (OEt)_{2}$ , $H_{2} C = C (OEt)_{2}$
2. B. $EtO - C H_{2} - CHO$ , $EtO - C H_{2} - CH (OH) (O^{t} Bu)$
3. C. $EtO - C H_{2} - CH (OEt)_{2}$ , $H_{2} C = C (OEt)_{2}$
4. D. $Br - C H_{2} - CH (OEt)_{2}$ , $^{t} BuO - C H_{2} - CH (OEt)_{2}$
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Answer: A
Q732021 · 25 Jul 2021 · Shift 2
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Answer: D
Q652021 · 22 Jul 2021 · Shift 2
1. A. $H_{3} PO_{2} and CH_{3} CH_{2} Cl$
2. B. $CH_{3} CH_{2} OH and H_{3} PO_{2}$
3. C. $H_{3} PO_{2} and CH_{3} CH_{2} OH$
4. D. $CH_{3} CH_{2} Cl and H_{3} PO_{2}$
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Answer: A
Q722021 · 22 Jul 2021 · Shift 2
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Answer: C
Q842021 · 22 Jul 2021 · Shift 2· Numerical answer
Assume a cell with the following reaction $C u_{(s)} + 2A g^{+} (1 \times 1 0^{- 3} M) \to C u^{2 +} (0.250M) + 2A g_{(s)}$ $E_{ce l l}^{⊖} = 2.97 V$ $E_{ce l l}$ for the above reaction is ____ V. (Nearest integer) [Given : log 2.5 = 0.3979, T = 298 K]
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Answer: 3
Q672021 · 20 Jul 2021 · Shift 1
In the given reaction $3-Bromo-2, 2-dimethyl butane C_{2} H_{5} OH (M aj or P r o d u c t)^{'} A^{'}$ Product A is :
1. A.2-Ethoxy-3, 3-dimethyl butane
2. B.1-Ethoxy-3, 3-dimethyl butane
3. C.2-Ethoxy-2, 3-dimethyl butane
4. D.2-Hydroxy-3, 3-dimethyl butane
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Answer: C
Q662021 · 18 Mar 2021 · Shift 1
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Answer: C
Q782021 · 18 Mar 2021 · Shift 2
In basic medium, $H_{2} O_{2}$ exhibits which of the following reactions? (A) $M n^{2 +} \to M n^{4 +}$ (B) $I_{2} \to I^{-}$ (C) $PbS \to PbS O_{4}$ Choose the most appropriate answer from the options given below :
1. A.(B) only
2. B.(A), (B) only
3. C.(A) only
4. D.(A), (C) only
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Answer: B
Q632021 · 16 Mar 2021 · Shift 1
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Answer: D
Q732021 · 16 Mar 2021 · Shift 1
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Answer: B
Q612021 · 26 Feb 2021 · Shift 1
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Answer: A
Q632021 · 26 Feb 2021 · Shift 1
Find A, B and C in the following reactions : $N H_{3} + A + C O_{2} \to (N H_{4})_{2} C O_{3}$ $(N H_{4})_{2} C O_{3} + H_{2} O + B \to N H_{4} H C O_{3}$ $N H_{4} H C O_{3} + N a C l \to N H_{4} C l + C$
1. A. $A - O_{2}; B - C O_{2}; C - N a_{2} C O_{3}$
2. B. $A - H_{2} O; B - O_{2}; C - N a H C O_{3}$
3. C. $A - H_{2} O; B - O_{2}; C - N a_{2} C O_{3}$
4. D. $A - H_{2} O; B - C O_{2}; C - N a H C O_{3}$
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Answer: D
Q702021 · 26 Feb 2021 · Shift 1
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Answer: D
Q682021 · 26 Feb 2021 · Shift 2
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Answer: C
Q702021 · 26 Feb 2021 · Shift 2
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Answer: A
Q722021 · 26 Feb 2021 · Shift 2
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Answer: A
Q622021 · 25 Feb 2021 · Shift 2
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Answer: C
Q672021 · 25 Feb 2021 · Shift 2
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Answer: A
Q732021 · 25 Feb 2021 · Shift 2
The major product of the following reaction is : $C H_{3} C H_{2} CH = C H_{2} H_{2} /CO Rh catalyst$
1. A. $C H_{3} C H_{2} C H_{2} CHO$
2. B. $C H_{3} C H_{2} C (CHO) = C H_{2}$
3. C. $C H_{3} C H_{2} CH = CH - CHO$
4. D. $C H_{3} C H_{2} C H_{2} C H_{2} CHO$
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Answer: D