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Aldehydes, Ketones and Carboxylic Acids · Question 9

JEE Main 2026 (Online) 2nd April Evening ShiftMCQHard📈 Topic in 10% papers+4−1
1

A molecule (X) with following structure under mild acidic condition is hydrolysed to produce (Y) and (Z). Identify the correct statements about (Y) and (Z). [figure] Choose the correct answer from the options given below :

  1. A, B and C Only
  2. B and C Only
  3. C and D Only
  4. A and D Only

Answer

(4) A and D Only

Solution

X is a divinyl-type (enol) ether: CH3-CH=CH-O-C(CH3)=CH2.

Mild acid hydrolysis cleaves the C–O bonds and gives two enols, which tautomerise to carbonyl compounds:

CH3-CH=CH-OH CH3CH2CHO (propanal, Y)

CH2=C(OH)-CH3 CH3COCH3 (propanone, Z)

A: both are C3H6O (58 g mol-1) ⇒ true.

B: neither is an acid, so neither reacts with NaHCO3 ⇒ false.

C: aldehydes are more reactive than ketones towards nucleophilic addition (less steric hindrance, more positive C) ⇒ propanal adds HCN faster ⇒ false.

D: both carbonyl compounds react with 2,4-DNP (addition followed by elimination) ⇒ true.

∴ A and D only.

Answer: (4)

JEE Main 2026 (Online) 2nd April Evening Shift

Keep practising — Aldehydes, Ketones and Carboxylic Acids

2

Given below are the four isomeric compounds (P, Q, R, S) [figure] Identify correct statements from below. Choose the correct option.

  1. C and E only
  2. A and E only
  3. A, B, D and E only
  4. A, C and E only
JEE Main 2026 (Online) 28th January Morning Shift
3

The correct order of acidic strength of the major products formed in the given reactions, is : Choose the correct answer from the options given below :

  1. C > A > D > B
  2. A > D > C > B
  3. A > D > B > C
  4. C > B > A > D
JEE Main 2026 (Online) 28th January Evening Shift
4

A student is given one compound among the following compounds that gives positive test with Tollens' reagent. [figure] The compound is :

  1. B
  2. D
  3. A
  4. C
JEE Main 2026 (Online) 24th January Morning Shift
5

The unsaturated ether on acidic hydrolysis produces carbonyl compounds as shown below :- [figure] Based on this, predict the solution/reagent that will help to distinguish "P" and "Q" obtained in the following reaction :- CH3-CH=CH-O- CH3 |C=CH2 [ ]H3O P + Q

  1. Saturated NaHSO3 solution
  2. Fehling solution
  3. Lucas reagent
  4. 2,4-DNP reagent
JEE Main 2026 (Online) 24th January Evening Shift
6

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below

  1. Statement I is true but Statement II is false
  2. Both Statement I and Statement II are false
  3. Both Statement I and Statement II are true
  4. Statement I is false but Statement II is true
JEE Main 2026 (Online) 24th January Evening Shift
7

Grignard reagent RMgBr (P) reacts with water and forms a gas (Q). One gram of Q occupies 1.4 dm3 at STP. (P) on reaction with dry ice in dry ether followed by H3O+ forms a compound (Z). 0.1 mole of (Z) will weigh g. (Nearest integer)

JEE Main 2026 (Online) 24th January Evening Shift
8

'x' is the product which is obtained from propanenitrile and stannous chloride in the presence of hydrochloric acid followed by hydrolysis. 'y' is the product which is obtained from the but-2-ene by the ozonolysis followed by hydrolysis. From the following, which product is not obtained when one mole of 'x' and one mole of 'y' react with each other in the presence of alkali followed by heating?

  1. 2-Methylpent-2-enal
  2. 2-Methylbut-2-enal
  3. 3-Methylbut-2-enal
  4. Pent-2-enal
JEE Main 2026 (Online) 23rd January Morning Shift
9

[figure] The correct sequence of reagents for the above conversion of X to Y is :

  1. (i) NaOH(aq), (ii) Jones reagent, (iii) H3O+
  2. (i) NaOEt, (ii) B2H6/H2O2, (iii) Jones reagent
  3. (i) Jones reagent, (ii) NaOEt, (iii) Hot KMnO4/KOH
  4. (i) B2H6/H2O2, (ii) NaOEt, (iii) Jones reagent
JEE Main 2026 (Online) 23rd January Morning Shift
10

Which of the following statements are TRUE about Haloform reaction? Choose the correct answer from the options given below :

  1. A, B & C Only
  2. A, C & E Only
  3. B, D & E Only
  4. A & C Only
JEE Main 2026 (Online) 23rd January Evening Shift
11

Iodoform test can differentiate between Choose the correct answer from the options given below :

  1. A, B & E Only
  2. A & D Only
  3. A & E Only
  4. B, C & E Only
JEE Main 2026 (Online) 23rd January Evening Shift

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