Home
Class 12
CHEMISTRY
Alcohol (ROH) does not react with NaBr t...

Alcohol (ROH) does not react with NaBr to form alkyl bromide because

A

NaBr is in soluble in alcohol

B

`Br^(-)` is strong base than `OH^(-)`

C

NaBr is an ionic compound

D

`OH^(-)` is a strong base than `Br^(-)`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question of why alcohol (ROH) does not react with NaBr to form alkyl bromide, we can break down the reasoning step by step. ### Step 1: Understanding the Reactants - **Alcohol (ROH)**: This is a covalent compound where R represents an alkyl group and OH is the hydroxyl group. - **Sodium Bromide (NaBr)**: This is an ionic compound composed of Na⁺ and Br⁻ ions. **Hint**: Identify the nature of the compounds involved (ionic vs. covalent) to understand their reactivity. ### Step 2: Analyzing the Reaction When alcohol reacts with NaBr, we expect Br⁻ to act as a nucleophile and replace the OH group in alcohol to form an alkyl bromide (RBr). **Hint**: Consider the role of nucleophiles in substitution reactions. ### Step 3: Nucleophile Strength - **Br⁻ as a Nucleophile**: While Br⁻ is a nucleophile, it is not as strong as the hydroxide ion (OH⁻). - **OH⁻ as a Nucleophile**: The hydroxide ion is a stronger nucleophile compared to Br⁻. **Hint**: Compare the nucleophilicity of Br⁻ and OH⁻ to understand why substitution does not occur. ### Step 4: Solubility of NaBr in Alcohol NaBr is an ionic compound and is generally insoluble in organic solvents like alcohol. This means that NaBr does not dissociate into Na⁺ and Br⁻ ions in the alcohol medium. **Hint**: Recall that ionic compounds typically dissolve in polar solvents, while alcohols are less polar. ### Step 5: Conclusion Due to the following reasons: 1. Br⁻ is a weaker nucleophile compared to OH⁻, making it unable to replace the hydroxyl group. 2. NaBr is insoluble in alcohol, preventing the necessary ions from being available for the reaction. Therefore, alcohol (ROH) does not react with NaBr to form alkyl bromide. **Final Answer**: Alcohol (ROH) does not react with NaBr to form alkyl bromide because: - Br⁻ is a weaker nucleophile compared to OH⁻. - NaBr is insoluble in alcohol.
Promotional Banner

Similar Questions

Explore conceptually related problems

Alcohols react with Grignard reagent to form

Alkyl iodides reacts with NaCN to form alkyl cyanides plus a little amount of alkyl isocyanides. The reason for the formation two types of products is-

A bromide ion does not intefere with the chromyl chloride test because when a bromide is present:

Haloalkanes react with KCN to form alkyl cyanides as main product while AgCN forms isocyanides as the chief product. Explain.

Under what conditions does coke react with water to form water gas?

Propene reacts with HBr to give isopropyl bromide but does not give n-propyl bromide.

An alkyl bromide undergoes reaction in the alkaline medium to form the corresponding alcohol. When the concentration of the alkyl bromide is doubled keeping the concentration of the alkali constant, the rate of the reaction is doubled. When the concentration of the alkali is doubled keeping the concentration of the alkyl bromide constant, the rate of reaction remains the same. Write the mechanistic steps for the reaction and state the type of the reaction and the nature of the reagent.

Give reasons for the following in one or two sentences : i. Methane does not react with chlorine in dark. ii. Propene reacts with HBr to give isopropy bormide but does not give -n propyl bromide.