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Organic Chemistry Questions and Answers – Nucleophiles | 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 of the following is not true about nucleophile?
[A] donates an electron pair to an electrophile to form a chemical bond
[B] all molecules or ions with a free pair of electrons or at least one pi bond can act as nucleophiles
[C] nucleophile are Lewis acids by definition
[D] a nucleophile becomes attracted to a full or partial positive charge
Answer: nucleophile are Lewis acids by definition
(2) Which halogen nucleophile is weakest in polar, aprotic solvents?
[A] I–
[B] F–
[C] Cl–
[D] Br–
Answer: I–

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(3) Which of the following nucleophile can be used for partial enolization 1,3-Dicarbonyl compound?
[A] Lithium di-isopropyl amide (LDA)
[B] Et-O–
[C] Weak base like NaOH
[D] Sodium acetate
Answer: Sodium acetate
(4) What will be the number of products (excluding stereoisomers) in the given reaction?

C6H5CHO + CH3-CHO + NaOH → Product

[A] One
[B] Three
[C] Two
[D] Four
Answer: Two
(5) Where will nucleophile (-OH) will attack to form which of the following the product X?

[A] (a)
[B] (b)
[C] (c)
[D] (d)
Answer: (d)
(6) Which reagent is a good nucleophile?
[A] NH3
[B] BH3
[C] Br2
[D] HBr
Answer: NH3
(7) Which of the following statements is true about ammonia and water?
[A] ammonia is more basic and more nucleophilic than water
[B] ammonia is less basic and less nucleophilic than water
[C] ammonia is more basic but less nucleophilic than water
[D] ammonia is less basic but more nucleophilic than water
Answer: ammonia is more basic and more nucleophilic than water
(8) Which of the following statements is true about the following two anionic molecules?

[A] I is more basic and more nucleophilic than II
[B] I is less basic and less nucleophilic than II
[C] I is more basic but less nucleophilic than II
[D] I is less basic but more nucleophilic than II
Answer: I is more basic but less nucleophilic than II
(9) Which halide ion is the best nucleophile in dimethyl sulfoxide solution?
[A] I–
[B] F–
[C] Cl–
[D] Br–
Answer: F–
(10) Which of the following cannot react as a nucleophile?
[A] CH3NH2
[B] (CH3)2NH
[C] (CH3)3N
[D] (CH3)4N+
Answer: (CH3)4N+

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