NEET
Practice Test 16
Previous Solution Next

These are Assertion-Reason type questions. Each of these question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer these questions from the following four options.

Statement-1 :Lower aldehyde and ketones are soluble in water but the solubility decreases as molecular massincreases.

Statement-2 :Aldehydes and ketones can be distinguished by Tollen’s reagent.

  • Solution

    It is true that lower aldehyde and ketones are soluble in water but as the molecular massincreases their solubility decreases. On adding Tollen’s reagent to a solution of Carbonyl compound if silver mirror is obtained than it is aldehyde. Therefore Tollen’s reagent is used for the identification of aldehydes and ketones. Here,Statement-1 and Statement-2 both are true but the Statement-2 is not the correct explanation of Statement-1.

These are Assertion-Reason type questions. Each of these question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer these questions from the following four options.

Statement-1 :Benzaldehyde is more reactive than ethanol towards nucleophilic attack.

Statement-2 :The overall effect of –I and+ R effect of phenyl group decreases the electron density on the carbon atom of > C = O group in benzaldehyde.

  • Solution

    Benzaldehyde is less reactive than ethanol towards nucleophilic attack. The combined effect of –I and +R effect of phenyl group is electron donating which increases the electron density on the carbon atom of the> C= O in benzaldehyde.

These are Assertion-Reason type questions. Each of these question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer these questions from the following four options.

Statement-1 :Acetic acid does not undergo haloform reaction.

Statement-2 :Acetic acid has no alpha hydrogens.

Read the passage given below and answer the questions that follow :

A carbonyl compound P, which gives positive iodoform test,undergoes reaction with MeMgBr followed by dehydration togive an olefin Q. Ozonolys is of Q leads to a dicarbonyl compound R, which undergoes intramolecular aldol reaction to give predominantly S.

The structure of the product S is

  • Solution

    Iodoform test of compound P points out that P has– COCH3 group which shows that it may be either option(a) or (b). Further since the dicarbonyl compound R has at least one α-H atom (as it undergoes aldol reaction) w.r.tone of the carbonyl groups which is possible when R is produced from (b) ; (a) option will give dicarbonyl

Read the passage given below and answer the questions that follow :

A carbonyl compound P, which gives positive iodoform test,undergoes reaction with MeMgBr followed by dehydration togive an olefin Q. Ozonolys is of Q leads to a dicarbonyl compound R, which undergoes intramolecular aldol reaction to give predominantly S.

The structures of the products Q and R, respectively, are

  • Solution

    Iodoform test of compound P points out that P has– COCH3 group which shows that it may be either option(a) or (b). Further since the dicarbonyl compound R has at least one α-H atom (as it undergoes aldol reaction) w.r.tone of the carbonyl groups which is possible when R is produced from (b) ; (a) option will give dicarbonyl

Read the passage given below and answer the questions that follow :

A carbonyl compound P, which gives positive iodoform test,undergoes reaction with MeMgBr followed by dehydration togive an olefin Q. Ozonolys is of Q leads to a dicarbonyl compound R, which undergoes intramolecular aldol reaction to give predominantly S.

The structure of the carbonyl compound P is

  • Solution

    Iodoform test of compound P points out that P has– COCH3 group which shows that it may be either option(a) or (b). Further since the dicarbonyl compound R has at least one α-H atom (as it undergoes aldol reaction) w.r.tone of the carbonyl groups which is possible when R is produced from (b) ; (a) option will give dicarbonyl

An organic compound A upon reacting with NH3 gives B.On heating B gives C. C in presence of KOH reacts with Br2 to given CH3CH2NH2. A is:

  • Solution

The compound that undergoes decarboxylation most readily under mild condition is

  • Solution

    β-Ketoacids undergo decarboxylation easily.

The major product H of the given reaction sequence is

  • Solution

The number of aldol reaction(s) that occurs in the given transformation is :

  • Solution

UnAttempted

0

Attempted

0

Correct

0

Wrong

0

Complete
ALDEHYDES, KETONES AND CARBOXYLIC ACIDS
Attempted     
Correct
UnAttempted
Wrong