PYQSide ExamsMy practice

Aldehydes, Ketones and Carboxylic Acids · Question 9

NEET (UG) 2024MCQMedium📈 Topic in 50% papers+4−1
1

Identify the correct reagents that would bring about the following transformation. [figure]

  1. (i) H2O/H+, (ii) CrO3
  2. (i) BH3, (ii) H2O2/OH , (iii) PCC
  3. (i) BH3, (ii) H2O2/OH , (iii) alk. KMnO4
  4. (i) H2O/H+, (ii) PCC

Answer

(2) (i) BH3, (ii) H2O2/OH , (iii) PCC

Solution

The product is an aldehyde with the C=O at the terminal carbon, so water must add in the anti-Markovnikov way and the primary alcohol must then be oxidised only up to the aldehyde.

(i) BH3, (ii) H2O2/OH (hydroboration–oxidation): C6H11CH2CH=CH2 C6H11CH2CH2CH2OH

(iii) PCC oxidises the 1 alcohol to the aldehyde: C6H11CH2CH2CH2OH C6H11CH2CH2CHO

H2O/H+ (Markovnikov) would give a 2 alcohol and hence a ketone; alk. KMnO4 would oxidise further to the acid.

Answer: (2)

NEET (UG) 2024

Keep practising — Aldehydes, Ketones and Carboxylic Acids

2

Fehling's solution 'A' is

  1. aqueous copper sulphate
  2. alkaline copper sulphate
  3. alkaline solution of sodium potassium tartrate (Rochelle's salt)
  4. aqueous sodium citrate
NEET (UG) 2024
3

Match List I with List II. Choose the correct answer from the options given below:

  1. A-IV, B-I, C-III, D-II
  2. A-III, B-I, C-II, D-IV
  3. A-IV, B-I, C-II, D-III
  4. A-I, B-IV, C-II, D-III
NEET (UG) 2024
4

Select the incorrect reaction among the following :

  1. CH3COCl [ ]H2O CH3COOH
  2. [figure]
  3. CH3CH2OH [(ii) H3O ](i) KMnO4/OH- CH3COOH
  4. CH3CH2CH2OH CrO3-H2SO4 CH3CH2COOH
RE-NEET (UG) 2024
5

Identify product (A) in the following reaction : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2023
6

Complete the following reaction: [figure] [C] is .

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2023
7

Identify the major product obtained in the following reaction: [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2023
8

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

  1. Both Statement I and Statement II are correct
  2. Both Statement I and Statement II are incorrect
  3. Statement I is correct but Statement II is incorrect
  4. Statement I is incorrect but Statement II is correct
NEET (UG) 2022
9

RMgX + CO2 [ether]dry Y H3O+ RCOOH What is Y in the above reaction?

  1. RCOO-Mg+X
  2. R3CO-Mg+X
  3. RCOO-X+
  4. (RCOO)2Mg
NEET (UG) 2022
10

Match List-I with List-II. Choose the correct answer from the options given below

  1. (a) - (iii), (b) - (iv), (c) - (ii), (d) - (i)
  2. (a) - (ii), (b) - (iii), (c) - (iv), (d) - (i)
  3. (a) - (i), (b) - (iii), (c) - (ii), (d) - (iv)
  4. (a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
NEET (UG) 2022
11

Which one of the following is not formed when acetone reacts with 2-pentanone in the presence of dilute NaOH followed by heating?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2022

All Aldehydes, Ketones and Carboxylic Acids PYQs →

PDFDownload Aldehydes, Ketones and Carboxylic Acids PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Chemistry chapters