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Out of p-tolualdehyde and p-nitrobenzaldehyde, which one is more reactive towards nucleophilic addition reactions, why? - Chemistry

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प्रश्न

Out of p-tolualdehyde and p-nitrobenzaldehyde, which one is more reactive towards nucleophilic addition reactions, why?

संक्षेप में उत्तर

उत्तर

P-nitrobenzaldehyde is more reactive towards the nucleophilic addition reaction than p- tolualdehyde as Nitro group is electron withdrawing in nature. Presence of nitro group decrease electron density, hence facilitates the attack of nucleophile. The presence of \[\ce{-CH3}\] leads to +I effect as \[\ce{-CH3}\] is electron releasing group.

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2023-2024 (March) Board Sample Paper

संबंधित प्रश्न

Predict the products of the following reactions:

 


Write the products formed when CH3CHO reacts with the following reagents : HCN

 


What is meant by the following term? Give an example of the reaction in the following case.

Schiff’s base


How will you bring about the following conversion in not more than two steps?

Bromobenzene to 1-Phenylethanol


Write a test to differentiate between pentan-2-one and pentan-3-one.


The following questions are case-based questions. Read the passage carefully and answer the questions that follow:

The carbon-oxygen double bond is polarised in aldehydes and ketones due to higher electronegativity of oxygen relative to carbon. Therefore, they undergo nucleophilic addition reactions with a number of nucleophiles such as HCN, NaHSO3, alcohols, ammonia derivatives and Grignard reagents. Aldehydes are easily oxidised by mild oxidising agents as compared to ketones. The carbonyl group of carboxylic acid does not give reactions of aldehydes and ketones. Carboxylic acids are considerably more acidic than alcohols and most of simple phenols.

Answer the following:

(a) Write the name of the product when an aldehyde reacts with excess alcohol in the presence of dry HCl. (1)

(b) Why carboxylic acid is a stronger acid than phenol? (1)

(c) (i) Arrange the following compounds in increasing order of their reactivity towards CH3MgBr: (1)

CH3CHO, \[\begin{array}{cc}
\ce{(CH3)3C-C-CH3}\\
\phantom{....}||\\
\phantom{....}\ce{O}
\end{array}\],  \[\begin{array}{cc}
\ce{CH3-C-CH3}\\
||\\
\ce{O}
\end{array}\]

(ii) Write a chemical test to distinguish between propanal and propanone. (1)

OR

(c) Write the main product in the following: (2)

(i)
(ii)

Write the structure of the product formed when acetone reacts with 2, 4 DNP reagent.


Draw the structure of the following derivative.

The ethylene ketal of hexan-3-one


Draw structure of the following derivative.

The ethylene ketal of hexan-3-one


Draw structure of the following derivative.

The ethylene ketal of hexan-3-one 


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