MHT CET · Chemistry · Haloalkanes and Haloarenes
Which among the following is haloalkyne?
- A \(\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}=\mathrm{CH}-\mathrm{X}\)
- B \(\mathrm{CH}_3-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_2-\mathrm{X}\)
- C \(\mathrm{CH} \equiv \mathrm{C}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{X}\)
- D \(\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{C} \equiv \mathrm{C}-\mathrm{X}\)
Answer & Solution
Correct Answer
(D) \(\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{C} \equiv \mathrm{C}-\mathrm{X}\)
Step-by-step Solution
Detailed explanation
A haloalkyne is a compound that contains both a halogen \((X)\) and a triple bond (alkyne group, \(\mathrm{C} \equiv \mathrm{C}\) ). Let's analyze the given options:
- (A) \(\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}=\mathrm{CH}-X\) : This is a haloalkene, not a haloalkyne. The structure has a double bond \((\mathrm{C}=\mathrm{CH})\), not a triple bond \((\mathrm{C} \equiv \mathrm{C})\). Therefore, this is not a haloalkyne.
- (B) \(\mathrm{CH}_3-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_2-\mathrm{X}\) : This is a haloalkyne. It contains a triple bond ( \(\mathrm{C} \equiv \mathrm{C}\) ) between carbon atoms and a halogen \((\mathrm{X})\) attached to a carbon. This matches the definition of a haloalkyne.
- (C) \(\mathrm{CH} \equiv \mathrm{C}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{X}\) : This is a haloalkyne as it contains a triple bond \((\mathrm{C} \equiv \mathrm{C})\) and a halogen \((\mathrm{X})\) attached to a carbon.
- (D) \(\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{C} \equiv \mathrm{C}-\mathrm{X}\) : This is also a haloalkyne, containing a triple bond \((\mathrm{C} \equiv \mathrm{C})\) and a halogen \((X)\) attached to a carbon.
- (A) \(\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}=\mathrm{CH}-X\) : This is a haloalkene, not a haloalkyne. The structure has a double bond \((\mathrm{C}=\mathrm{CH})\), not a triple bond \((\mathrm{C} \equiv \mathrm{C})\). Therefore, this is not a haloalkyne.
- (B) \(\mathrm{CH}_3-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_2-\mathrm{X}\) : This is a haloalkyne. It contains a triple bond ( \(\mathrm{C} \equiv \mathrm{C}\) ) between carbon atoms and a halogen \((\mathrm{X})\) attached to a carbon. This matches the definition of a haloalkyne.
- (C) \(\mathrm{CH} \equiv \mathrm{C}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{X}\) : This is a haloalkyne as it contains a triple bond \((\mathrm{C} \equiv \mathrm{C})\) and a halogen \((\mathrm{X})\) attached to a carbon.
- (D) \(\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{C} \equiv \mathrm{C}-\mathrm{X}\) : This is also a haloalkyne, containing a triple bond \((\mathrm{C} \equiv \mathrm{C})\) and a halogen \((X)\) attached to a carbon.
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