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Byju's Answer
Standard XII
Chemistry
Electrophiles and Nucleophiles
Is a Carbanio...
Question
Is a Carbanion Nucleophile?
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Solution
Yes,
carbanion is a
nucleophile.
Carbanion:
A carbanion is a negatively charged ion in which a carbon holds a negative charge of at least −1. For example:
CH
3
CH
2
-
,
CH
3
-
CH
-
-
CH
3
, etc.
Nucleophiles
: These are chemical species containing negative charge and form bonds by donating an electron pair. For example:
Br
-
,
Cl
-
, etc.
Because both have negative charge and they have tendency to share its electron for bond formation.
Thus, a carbanion is a nucleophile.
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2
Similar questions
Q.
Carbocations react with nucleophiles and carbanions react with electrophiles very quickly.
Q.
How many of the following statments are correct regarding Claisen condensation reaction (when an ester is treated with a strong base)?
1. A proton is removed from the
α
-carbon to form a resonance stabilised carbanion of the ester.
2. Carbanion acts as a nucleophile in a nucleophilic acyl substitution reaction with another ester molecule.
3. A new
C
−
C
bond is formed.
4.
α
,
β
unsaturated product is obtained
Q.
34. What is the stability order for the following carbanions----- A) benzylic carbanion B) phenyl carbanion C) allylic carbanion D) vinyl carbanion
Q.
18. Stability order of carbanion in A. Ethyne carbanion B. Allyl carbanion C. Benzyl carbanion D. Tertiary carbanion
Q.
Match the reactions in
Column-I
with appropriate types of steps/reactive intermediate involved in these reactions as given in
Column-II
Column-I
(A)
(B)
(C)
(D)
Column II
(p)
Nucleophilic substitution
(q)
Electrophilic substitution
(r)
Dehydration
(s)
Nucleophilic addition
(t)
Carbanion
aq. \( NaOH \)
\( CH _{3} MgI = \)
\( \stackrel{ H _{2} SO _{4}}{\longrightarrow} \)
\( H _{2} SO _{4} \rightarrow \)
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