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HVZ, reaction is not given by :...

HVZ, reaction is not given by :

A

`RCH_(2)COOH`

B

`CH_(2)COOH`

C

`R_(3)C COOH`

D

RCOOH

Text Solution

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The correct Answer is:
To determine which compound does not undergo the HVZ (Hunsdiecker-Von Baeyer) reaction, we need to understand the requirements for this reaction to occur. The HVZ reaction involves the bromination of carboxylic acids at the alpha carbon, which requires the presence of alpha hydrogen atoms. ### Step-by-Step Solution: 1. **Understand the HVZ Reaction**: The HVZ reaction is a chemical reaction where a carboxylic acid reacts with bromine (Br2) in the presence of phosphorus tribromide (PBr3) to replace the alpha hydrogen with a bromine atom. 2. **Identify the Role of Alpha Hydrogen**: For the HVZ reaction to occur, the carboxylic acid must have at least one alpha hydrogen atom attached to the alpha carbon (the carbon adjacent to the carboxyl group). If there are no alpha hydrogens, the reaction cannot proceed. 3. **Analyze the Given Compounds**: - **Compound A**: Contains alpha hydrogen(s) – can undergo HVZ reaction. - **Compound B**: Contains alpha hydrogen(s) – can undergo HVZ reaction. - **Compound C**: Does not contain any alpha hydrogen – cannot undergo HVZ reaction. - **Compound D**: Contains alpha hydrogen(s) – can undergo HVZ reaction. 4. **Conclusion**: The compound that does not give the HVZ reaction is the one that lacks alpha hydrogen atoms. In this case, **Compound C** is the correct answer. ### Final Answer: The compound that does not undergo the HVZ reaction is the one without alpha hydrogen, which is **Compound C**.
To determine which compound does not undergo the HVZ (Hunsdiecker-Von Baeyer) reaction, we need to understand the requirements for this reaction to occur. The HVZ reaction involves the bromination of carboxylic acids at the alpha carbon, which requires the presence of alpha hydrogen atoms. ### Step-by-Step Solution: 1. **Understand the HVZ Reaction**: The HVZ reaction is a chemical reaction where a carboxylic acid reacts with bromine (Br2) in the presence of phosphorus tribromide (PBr3) to replace the alpha hydrogen with a bromine atom. 2. **Identify the Role of Alpha Hydrogen**: For the HVZ reaction to occur, the carboxylic acid must have at least one alpha hydrogen atom attached to the alpha carbon (the carbon adjacent to the carboxyl group). If there are no alpha hydrogens, the reaction cannot proceed. ...
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    Carboxylic acids having at least one alpha -hydrogen react with Cl_(2)" or "Br_(2) in the presnence of red phosphorus to give alpha -halo acids. The reaction is known as H.V.Z. reaction. The HVZ reaction is limited to the formation of alpha -chloro acid and alpha -bromo acid and it is sometimes difficult to carry out the reaction. Answer the following questions : Which of the following carboxylic acids will not give HVZ reaction ?

    Carboxylic acids having at least one alpha -hydrogen react with Cl_(2) or Br_(2) in the presence of phosphorous to give alpha -halo acids. The reaction is known as Hell -volhar-Zelinsky reaction (HVZ reaction). R-CH_(2)-CO OH overset(P//Br_(2))underset(Delta)toR-CH(Br)CO OH The HVZ reaction is limited to the formation of alpha -chloro and alpha -bromo acids and it is sometimes backward to carry out. the reagents ( X_(2) and P ) are noxious and the reaction time is often long and the conditions of reaction are harsh. Which of the following will be obtained when acetic acid is subjected to HVZ reaction ?

    Carboxylic acids having at least one alpha -hydrogen react with Cl_(2) or Br_(2) in the presence of phosphorous to give alpha -halo acids. The reaction is known as Hell -volhar-Zelinsky reaction (HVZ reaction). R-CH_(2)-CO OH overset(P//Br_(2))underset(Delta)toR-CH(Br)CO OH The HVZ reaction is limited to the formation of alpha -chloro and alpha -bromo acids and it is sometimes backward to carry out. the reagents ( X_(2) and P ) are noxious and the reaction time is often long and the conditions of reaction are harsh. Which of the following carboxylic acids will not give HVZ reaction ?

    Carboxylic acids having atleast one alpha -hydrogen react with Cl_(2) or Br_(2) in the presence of phosphorus ( or a phosphorus halide) to give alpha -halo acids. This reaction is known as Hell-Volhard-Zelinsky reaction (HVZ reaction), R-CH_(2)COOHunderset(Delta)overset(P//Br_(2))toR-overset(Br)overset(|)"CH"-COOH The HVZ reaction is limited to the formation of alpha -chloro and a-bromo acids and it is sometimes awkward to carry out. The reagents ( X_(2) and P) are noxious and the reaction time is often long and the conditions of reaction are harsh. CH_(3)COOHoverset(Br_(2)//Red P)to(A)overset(NaCN)to(B)overset(HOH//H^(+))to(C ) The product (C) will be:

    Carboxylic acids having atleast one alpha -hydrogen react with Cl_(2) or Br_(2) in the presence of phosphorus ( or a phosphorus halide) to give alpha -halo acids. This reaction is known as Hell-Volhard-Zelinsky reaction (HVZ reaction), R-CH_(2)COOHunderset(Delta)overset(P//Br_(2))toR-overset(Br)overset(|)"CH"-COOH The HVZ reaction is limited to the formation of alpha -chloro and a-bromo acids and it is sometimes awkward to carry out. The reagents ( X_(2) and P) are noxious and the reaction time is often long and the conditions of reaction are harsh. CH_(3)CH_(2)COOHoverset(Red P +Br_(2))to(A)overset(alc. KOH)(B) . The product (B) is :

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