Aldehydes Ketones And Carboxylic Acids Test

Aldehydes Ketones And Carboxylic Acids

This is aldehydes ketones and carboxylic acids Test-02 for CBSE class 12 Chemistry.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Arrange the following sets of compounds in order of their increasing boiling points : Pentan – 1 – ol, butan – 1 – ol, butan – 2 – ol, ethanol, propan – 1 – ol, methanol
  • A
    Propan – 1 – ol, butan – 2 – ol, butan – 1 – ol, pentan – 1 – ol, methanol, ethanol
  • B
    Methanol, ethanol, propan – 1 – ol, butan – 2 – ol, butan – 1 – ol, pentan – 1 – ol.
    Correct
  • C
    Butan – 2 – ol, butan – 1 – ol, pentan – 1 – ol, methanol, ethanol, propan – 1 – ol,
  • D
    Pentan – 1 – ol Methanol, ethanol, propan – 1 – ol, butan – 2 – ol, butan – 1 – ol,
2
Arrange the following alcohols, hydrocarbon and ether in order of their increasing boiling points Pentan – 1 – ol, n – butane, pentanal, ethoxyethane.
  • A
    ethoxyethane, pentanal and pentan – 1 – ol, n – Butane
  • B
    pentan – 1 – ol , n – Butane, ethoxyethane, pentanal
  • C
    n – Butane, ethoxyethane, pentanal and pentan – 1 – ol.
    Correct
  • D
    pentanal and pentan – 1 – ol, n – Butane, ethoxyethane
3
IUPAC name of the following compound is
Question 3 figure 1
  • A
    2 – methoxy – 2 – methylethane
  • B
    1 – methoxy – 1 – methylethane
    Correct
  • C
    2 – methoxypropane
  • D
    isopropylmethyl ether
4
The reagents to bring about the change from but – 2 – ene to ethanal
  • A
    Option A
    Correct
  • B
    DIBAL – H
  • C
    PCC
  • D
    None of these
5
One of the following is used for the separation and purification of aldehydes
  • A
    hydrogen cyanide
  • B
    None of these
  • C
    Grignard reagent
  • D
    Sodium hydrogensulphite
    Correct
6
The aldehydes and ketones undergo one of the following reactions.
  • A
    None of these
  • B
    electrophilic addition reactions
  • C
    nucleophilic addition reactions
    Correct
  • D
    substitution reaction
7
The following reaction is
Question 7 figure 1
  • A
    Friedel – Crafts reaction
    Correct
  • B
    Etard reaction.
  • C
    Stephen reaction
  • D
    Gatterman – Koch reaction
8
Arrange the following compounds in decreasing order of their acid strength: i) trichloroacetic acid ii) trifluoroacetic acid iii) acetic acid and iv)formic acid
  • A
    trifluoroacetic acid, trichloroacetic acid, formic acid.and acetic acid
  • B
    trifluoroacetic acid, trichloroacetic acid, formic acid and acetic acid
    Correct
  • C
    trichloroacetic acid, trifluoroacetic acid, acetic acid and formic acid.
  • D
    trifluoroacetic acid, formic acid acetic acid and Propan – 1 – ol, 4 – methylphenol
9
$CH_3$CHO and $C_6$$H_5$$CH_2$CHO can be distinguished chemically by:
  • A
    Iodoform test
    Correct
  • B
    Tollen's reagent test
  • C
    Benedict test
  • D
    Iodoform test
10
Which of the following acids does not exhibit optical isomerism?
  • A
    Lactic acid
  • B
    α – amino acids
  • C
    Tartaric acid
  • D
    Maleic acid
    Correct
11
The correct sequence of steps involved in the mechanism of Cannizzaro's reaction is
  • A
    electrophilic attack by $OH^ –$ , transfer of $H^+$ and transfer of $H^ –$
  • B
    transfer of $H^+$, nucleophilic attack and transfer of $H^ –$
  • C
    nucleophilic attack, transfer of $H^ –$ and transfer of $H^+$
    Correct
  • D
    electrophilic attack by $OH^ –$ , transfer of $H^+$ and transfer of $H^ –$
12
The compound obtained when acetaldehyde reacts with dilute aqueous sodium hydroxide exhibits:
  • A
    geometrical isomerism
    Correct
  • B
    optical isomerism.
  • C
    neither optical nor geometrical isomerism
  • D
    both optical and geometrical isomerism
13
Benzaldehyde and acetone can be best distinguished using
  • A
    sodium hydroxide solution
  • B
    2, 4 – DNP
  • C
    Tollen's reagent
    Correct
  • D
    hydrazine
14
Acetone is treated with excess of ethanol in the presence of hydrochloric acid. The product obtained is:
Question 14 figure 1
  • A
    $CH_2Cl_2$
    Correct
  • B
    $C_2H_5OH$
  • C
    $C_3H_6$
  • D
    $C_2H_4$
15
Identify the product in the reaction
Question 15 figure 1
  • A
    PhCOCOMe
  • B
    Ph$CH_2$CO$CH_3$
  • C
    Ph$CH_2$$CH_2$CHO
  • D
    PhCO$CH_2CH_3$
    Correct