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Test: Electrophiles and Nucleophiles - Chemistry MCQ


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10 Questions MCQ Test - Test: Electrophiles and Nucleophiles

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Test: Electrophiles and Nucleophiles - Question 1

Which of the following is not true about nucleophile?

Detailed Solution for Test: Electrophiles and Nucleophiles - Question 1
- Nucleophiles are substances that donate an electron pair to an electrophile, which is a species that accepts electrons.
- They can be molecules or ions that have lone pairs of electrons or pi bonds, allowing them to participate in chemical reactions.
- Nucleophiles are classified as Lewis bases, not acids, because they donate electrons rather than accept them.
- They are attracted to areas with positive charge, which facilitates bond formation in chemical reactions.
Test: Electrophiles and Nucleophiles - Question 2

Which of the following statement is incorrect about electrophiles?

Detailed Solution for Test: Electrophiles and Nucleophiles - Question 2

Because electrophiles accept electrons, they are Lewis acids not Lewis base, according to Acid-Base reaction theories.

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Test: Electrophiles and Nucleophiles - Question 3

Which halogen nucleophile is weakest in polar, aprotic solvents?

Detailed Solution for Test: Electrophiles and Nucleophiles - Question 3

In polar, aprotic solvents, I the weakest and this is reversed in polar, protic solvents.

Test: Electrophiles and Nucleophiles - Question 4

In addition of halogen (Bromine) to an alkene, how can we isolate a bromonium in the reaction?

Detailed Solution for Test: Electrophiles and Nucleophiles - Question 4

A bromo-carbenium ion intermediate may be predominant instead of vicinyl dibromide if the alkene has a cation-stabilizing substituent like phenyl group. There is an example of the isolation of the bromonium ion.

Test: Electrophiles and Nucleophiles - Question 5

Which of the following nucleophile can be used for partial enolization 1,3-Dicarbonyl compound?

Detailed Solution for Test: Electrophiles and Nucleophiles - Question 5

Sodium acetate will do partial enolization of 1, 3-Dicarbonyl compound. Weak base like NaOH and Et-O will form an alcohol and LDA will do complete enolization.
The nucleophile used for partial enolization 1,3-Dicarbonyl compound is Sodium acetate

Test: Electrophiles and Nucleophiles - Question 6

Which of the following is not an electrophile?

Detailed Solution for Test: Electrophiles and Nucleophiles - Question 6

The ammonium ion cannot react at the N with a nucleophile because the N already has an octet of electrons.

Test: Electrophiles and Nucleophiles - Question 7

What will be the number of products (excluding stereoisomers) in the given reaction?
C6H5CHO + CH3-CHO + NaOH → Product

Detailed Solution for Test: Electrophiles and Nucleophiles - Question 7

First product will be formed by cross aldol where nucleophile (OH) will attack at different type or reactant molecule.
First product formed by cross aldol where nucleophile will attack at different type
Second type of product will be formed aldol condensation where reaction will occur between same type of molecule.
Second type of product formed aldol condensation where reaction occur between of molecule

Test: Electrophiles and Nucleophiles - Question 8

Which of the following is not an electrophile?

Detailed Solution for Test: Electrophiles and Nucleophiles - Question 8

An electrophile is a species that accepts an electron pair. In the given options:

H₂O (water) is not an electrophile because it is a nucleophile, meaning it donates an electron pair.

Test: Electrophiles and Nucleophiles - Question 9

Where will nucleophile (-OH) will attack to form which of the following the product X?
Find nucleophile (-OH) attack to form which of the following the product X

Detailed Solution for Test: Electrophiles and Nucleophiles - Question 9

Nucleophile (-OH) will attack at carbon adjacent to carbonyl bond and form the below product.
Nucleophile (-OH) attack at carbon adjacent to carbonyl bond & form below product

Test: Electrophiles and Nucleophiles - Question 10

In the given molecule where will electrophile will attack?
The electrophile will attack I in the given molecule

Detailed Solution for Test: Electrophiles and Nucleophiles - Question 10

-CH3O is a +M group, so it has lone pair to donate to upcoming electrophile.

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