Advertisements
Advertisements
Question
Benzaldehyde can be obtained from benzal chloride. Write reactions for obtaining benzalchloride and then benzaldehyde from it.
Advertisements
Solution

APPEARS IN
RELATED QUESTIONS
Predict the products of the following reactions:

Draw the structure of the semicarbazone of ethanal.
Write the structures of the main products when acetone (CH3 − CO − CH3) reacts with the following reagent :
H2N − NHCONH2/H+
What is meant by the following term? Give an example of the reaction in the following case.
Acetal
What is meant by the following term? Give an example of the reaction in the following case.
Ketal
How will you bring about the following conversion in not more than two steps?
Bromobenzene to 1-Phenylethanol
How are the following compounds prepared?
acetophenone from benzene
Write a test to differentiate between pentan-2-one and pentan-3-one.
Which one of the following gives only one monochloro derivative?
Which of the following has the most acidic hydrogen?
Acetaldehyde and acetone differ in their reaction with
Paraldehyde is formed as a result of polymerisation:-
What happens when ethanal is treated with excess ethanol and acid?
The increasing order of the following compounds towards HCN addition is:
| (i) | ![]() |
| (ii) | ![]() |
| (iii) | ![]() |
| (iv) | ![]() |
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) | ![]() |
Out of p-tolualdehyde and p-nitrobenzaldehyde, which one is more reactive towards nucleophilic addition reactions, why?
The product of the following reaction is
\[\begin{array}{cc}
\ce{O}\phantom{.........}\\
||\phantom{.........}\\
\ce{C2H5 - C - CH3 ->[H2/Ni][\Delta] \phantom{..}?}\end{array}\]
Draw the structure of the following derivative.
Acetaldehydedimethylacetal
Draw structure of the following derivative:
Acetaldehydedimethylacetal
Draw structure of the following derivative.
The ethylene ketal of hexan-3-one






