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Butanenitrile may be prepared by heating
  • a)
    n-propyl alcohol with KCN

  • b)
    n-butyl alcohol with KCN
  • c)
    n-butyl chloride with KCN
  • d)
    n-propyl chloride with KCN
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Butanenitrile may be prepared by heatinga)n-propyl alcohol with KCNb) ...
On reaction of n-propyl chloride with KCN, the nucleophilic substitution takes place, Cl- gets replaced by CN-. So, the resulting nitrile would have four carbon atoms, three of propyl chloride and one of CN-. Hence, option d is correct.
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Community Answer
Butanenitrile may be prepared by heatinga)n-propyl alcohol with KCNb) ...
Preparation of Butanenitrile (n-propyl cyanide)

Butanenitrile, also known as n-propyl cyanide, can be prepared by the reaction of n-propyl chloride with KCN (potassium cyanide). This reaction is an example of a nucleophilic substitution reaction.

Reaction:
n-Propyl chloride + KCN → n-Propyl cyanide + KCl

Explanation:
1. Nucleophilic Substitution Reaction:
The reaction between n-propyl chloride and KCN is a nucleophilic substitution reaction. In this reaction, the nucleophile (CN-) attacks the electrophilic carbon of n-propyl chloride, resulting in the substitution of the chloride ion with the cyanide ion.

2. Role of KCN:
Potassium cyanide (KCN) acts as a source of cyanide ions (CN-) in the reaction. The cyanide ion serves as the nucleophile in the reaction and replaces the chloride ion in n-propyl chloride.

3. Nature of n-Propyl Chloride:
n-Propyl chloride is an alkyl halide with the formula C3H7Cl. It contains a chlorine atom bonded to a carbon atom, which is also attached to a propyl group (three carbon atoms in a chain). The presence of a halogen atom (chlorine) makes it susceptible to nucleophilic substitution reactions.

4. Nature of Butanenitrile:
Butanenitrile, also known as n-propyl cyanide, is an organic compound with the formula C4H7CN. It is a nitrile, which is a functional group composed of a carbon atom triple-bonded to a nitrogen atom. In this compound, the nitrile group is attached to a propyl group (three carbon atoms in a chain).

5. Formation of KCl:
During the reaction, the chloride ion is replaced by the cyanide ion, resulting in the formation of n-propyl cyanide and potassium chloride (KCl). The KCl is a byproduct of the reaction and remains in the reaction mixture.

Conclusion:
Butanenitrile (n-propyl cyanide) can be prepared by heating n-propyl chloride with KCN (potassium cyanide) through a nucleophilic substitution reaction. This reaction allows for the substitution of the chloride ion with the cyanide ion, resulting in the formation of butanenitrile and potassium chloride as a byproduct.
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Butanenitrile may be prepared by heatinga)n-propyl alcohol with KCNb) n-butyl alcohol with KCNc) n-butyl chloride with KCNd) n-propyl chloride with KCNCorrect answer is option 'D'. Can you explain this answer?
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