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Organic Chemistry Questions and Answers – Reagents in Organic Chemistry | Organic Chemistry Multiple Choice Questions and Answers

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Free download in PDF Organic Chemistry Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(1) Which is the suitable catalyst for bringing out the transformation given below?

[A] BF3. Et20
[B] NaOEt
[C] tungsten lamp
[D] dibenzoyl peroxide
Answer: BF3. Et20
(2) Which of the will give effective reduction of 3-hexyne to trans-3-hexene?
[A] H2/Lindlar’s catalyst
[B] Na/liq. NH3
[C] Fe/NaCl
[D] DIBAL
Answer: Na/liq. NH3

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(3) Which of the reagent will give effective transformation of given compounds?

[A]

CH2N2

[B] CH3Li
[C] (CH3)2CuLi
[D] Ph3P = CH2
Answer: Ph3P = CH2
(4) Which is the mildest reducing agent which reduces only carbonyl group in presence of nitro, carboxyl, double bond and ester groups?
[A] LiAIH4
[B] Na-NH3
[C] NaBH4
[D] H2-Ni
Answer: NaBH4
(5) What will be the product for the given reactant and reagents?

[A] (a)
[B] (b)
[C] (c)
[D] (d)
Answer: (c)
(6) Which is the correct combination of reagent which can carry out following conversion?

[A] (i) CH3 – MgBr then H+ (ii) H2S04 / ∆ (iii) NH2 – NH2 / KOH
[B] (i) (CH3)2 CuLi then H+ (ii) NaBH4 EtOH (iii) H2S04 / ∆
[C] (i) CH3 – Li, then H+ (ii) PCC / ∆
[D] (i) NaBH4 ∙ CeCl3 then H+ (ii) MnO2 (iii) CH3 – Li
Answer: (i) CH3 – Li, then H+ (ii) PCC / ∆
(7) How acetophenone can be converted to phenol by reaction?
[A] m-CPBA followed by base catalysed hydrolysis
[B] conc. HN03
[C] iodine and NaOH
[D] Singlet oxygen followed by base catalysed hydrolysis product
Answer: m-CPBA followed by base catalysed hydrolysis
(8) How can we prepare RR’ R” OH by the action of excess of a suitable Grignard reagent on which of the following reactants?
[A] nitrile or an aldehyde
[B] ester or an alcohol
[C] aldehyde or a ketone
[D] ketone or an ester
Answer: nitrile or an aldehyde
(9) What is used to carry out the following conversion?
[A] hydroboration oxidation followed by Jones oxidation
[B] Wacker oxidation followed by haloform reaction
[C] oxymercuration-determination followed by Jones oxidation
[D] ozonolysis followed by haloform reaction
Answer: Wacker oxidation followed by haloform reaction
(10) How many isomers of C4H8O when reacts with CH3MgBr followed by acidification to alcohol (only consider carbonyl isomers and Including stereoisomers)?
[A] 2
[B] 3
[C] 4
[D] 5
Answer: 2

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