Advertisements
Advertisements
प्रश्न
Give a simple chemical test to distinguish between 
Advertisements
उत्तर
Distinguish between 
contains methyl group attached to carbonyl carbon atom, hence are oxidised by sodium hypoiodite to form carboxylic acids and form yellow coloured 3 CHI , which is not given by 
C6H5 at it is not a methyl ketone. 
APPEARS IN
संबंधित प्रश्न
How are the following compounds prepared?
benzaldehyde from benzoyl chloride
Write the main product formed when propanal reacts with the following reagents:
2 moles of 3 CH OH in presence of dry HCl
How will you convert benzoic acid to m-bromobenzoic acid?
The pH of blood does not appreciably change by a small addition of acid or base because
A Idol condensation will not be observed in
Acetaldehyde and acetone differ in their reaction with
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) |  |
Draw the structure of the following derivative.
The ethylene ketal of hexane-3-one
Draw the structure of the given derivative.
The ethylene ketal of hexan-3-one
Give an example of the reaction in the following case.
Oxime
