List of top Chemistry Questions on Aldehydes And Ketones asked in JEE Main

Given below are two statements :
Statement I : The condensation reaction between $CH_3-CH=O$ and
under optimum pH will produce
.
Statement II : The molecule,
will generate $Ph-CH=O$ in the presence of dilute acid.
In the light of the above statements, choose the correct answer from the options given below :

Observe the following reaction and same reaction is carried out with the following compound: 

X and Y can be differentiated by: 
 

The unsaturated ether on acidic hydrolysis produces carbonyl compounds as shown below. Based on this, predict the solution/reagent that will help to distinguish "P" and "Q" obtained in the reaction.

A student is given one compound among the following compounds that gives positive test with Tollen's reagent. The compound is:

Given below are two statements:
Statement I: Cross aldol condensation between two different aldehydes will always produce four different products.
Statement II: When semicarbazide reacts with a mixture of benzaldehyde and acetophenone under optimum pH, it forms a condensation product with acetophenone only.
Statement-I: Two different aldehydes on cross aldol condensation always give four products.
Statement-II: Among benzaldehyde and acetophenone, only acetophenone reacts with semicarbazide.
Which of the following are the compound(s) that do not give Tollen's test?
Which of the following gives positive $\text{Tollen's}$ test ?
Given below are two statements :
Statement I : Acidity of -hydrogens of aldehydes and ketones is responsible for Aldol reaction.
Statement II : Reaction between benzaldehyde and ethanal will NOT give Cross – Aldol product.In the light of above statements, choose the most appropriate answer from the options given below.

Which of the following reagent is suitable for the preparation of the product in the above reaction ? (reaction of ketone to alkane)

The major product of the following chemical reaction is : R-CN $\xrightarrow{(1) H_3O^+, \Delta (2) SOCl_2 (3) Pd/BaSO_4, H_2}$ ? (Using $R$ as the alkyl group from the prompt skeleton)

Consider the above reaction, the product 'X' and 'Y' respectively are 

In Tollen's test for aldehyde, the overall number of electron(s) transferred to the Tollen's reagent formula [Ag(NH₃)₂]⁺ per aldehyde group to form silver mirror is __________. (Round off to the Nearest Integer).

Considering the reaction of Benzene with CO and HCl in the presence of anhydrous AlCl₃/CuCl (Gattermann-Koch reaction), identify product X :