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12th Standard Chemistry Carbonyl Compounds English Medium Free Online Test One Mark Questions 2020 - 2021

12th Standard

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Chemistry

Time : 00:20:00 Hrs
Total Marks : 20
    Answer all the questions
    20 x 1 = 20
  1. Reaction of acetone with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is

    (a)

    Grignard reagent

    (b)

    Sn / HCl

    (c)

    hydrazine in presence of slightly acidic solution

    (d)

    hydrocyanic acid

  2. The correct structure of the product ‘A’ formed in the reaction

    (a)

    (b)

    (c)

    (d)

  3. \({ CH }_{ 2 }={ CH }_{ 2 }\overset { i){ O }_{ 3 } }{ \underset { zn/{ H }_{ 2 }O }{ \longrightarrow } } X\overset { { NH }_{ 3 } }{ \longrightarrow } Y \ 'Y'\) is

    (a)

    Formaldelyde

    (b)

    di acetone ammonia

    (c)

    hexamethylene tetraamine

    (d)

    oxime

  4. Assertion: 2,2 – dimethyl propanoic acid does not give HVZ reaction.
    Reason: 2 – 2, dimethyl propanoic acid does not have \(\alpha\) - hydrogen atom
    Codes:
    (A) if both assertion and reason are true and reason is the correct explanation of assertion.
    (B) if both assertion and reason are true but reason is not the correct explanation of assertion.
    (C) assertion is true but reason is false
    (D) both assertion and reason are false

    (a)

    if both assertion and reason are true and reason is the correct explanation of assertion.

    (b)

    if both assertion and reason are true but reason is not the correct explanation of assertion.

    (c)

    assertion is true but reason is false

    (d)

    both assertion and reason are false

  5. Benzoic acid \(\overset { i){ NH }_{ 3 } }{ \underset { ii)\Delta }{ \longrightarrow } } A\overset { NaOBr }{ \longrightarrow } B\overset { NaN{ O }_{ 2 }/HCl }{ \longrightarrow } C \ 'C' \ is\)

    (a)

    anilinium chloride

    (b)

    O – nitro aniline

    (c)

    benzene diazonium chloride

    (d)

    m– nitro benzoic acid

  6. CH3Br \(\overset { KCN }{ \longrightarrow } (A)\overset { { H }_{ 2 }{ O }^{ + } }{ \longrightarrow } (B)\overset { { PCl }_{ 5 } }{ \longrightarrow } \) (C) product (c) is

    (a)

    acetylchloride

    (b)

    chloro acetic acid

    (c)

    \(\alpha\)- chlorocyano ethanoic acid

    (d)

    none of these

  7. Identify the product formed in the reaction 

    (a)

    (b)

    (c)

    (d)

  8. Assertion: p – N, N – dimethyl amino benzaldehyde undergoes benzoin condensation
    Reason: The aldehydic (-CHO) group is meta directing.
    Codes:
    (A) if both assertion and reason are true and reason is the correct explanation of assertion.
    (B) if both assertion and reason are true but reason is not the correct explanation of assertion.
    (C) assertion is true but reason is false
    (D) both assertion and reason are false

    (a)

    if both assertion and reason are true and reason is the correct explanation of assertion.

    (b)

    if both assertion and reason are true but reason is not the correct explanation of assertion.

    (c)

    assertion is true but reason is false

    (d)

    both assertion and reason are false

  9. An alkene “A” on reaction with O3 and Zn - H2O gives propanone and ethanol in equimolar ratio. Addition of HCl to alkene “A” gives “B” as the major product. The structure of product “B” is

    (a)

    \(Cl-{ CH }_{ 2 }-CH_{ 2 }-\overset { \overset { CH_{ 3 } }{ | } }{ \underset { \underset { CH_{ 3 } }{ | } }{ CH } } \)

    (b)

    \({ H }_{ 3 }C-{ CH }_{ 2 }-\overset { \overset { CH_{ 2 }Cl }{ | } }{ CH } -{ CH }_{ 3 }\)

    (c)

    \(\\ { H }_{ 3 }C-{ CH }_{ 2 }-\overset { \overset { CH_{ 3 } }{ | } }{ \underset { \underset { CL{ } }{ | } }{ C } } -{ CH }_{ 3 }\)

    (d)

    \({ H }_{ 3 }C-{ CH }-\overset { \overset { CH_{ 3 } }{ | } }{ \underset { \underset { Cl }{ | } }{ C } } \)

  10. Give the common and IUPAC name of the compound HO-CH2-\(\underset { \overset { | }{ OH } }{ CH } \)-CHO

    (a)

    glyceraldehyde, hydroxy prop anal

    (b)

    glyceraldehyde, 2, 3 - dihydroxy prop anal

    (c)

    crotonaldehyde, hydroxy propanal

    (d)

    crotonaldehyde, 2, 3 - dihydroxy propanal

  11. Which of the following compounds will react with NaHCO3 solution to give sodium salt and CO2?

    (a)

    Acetic acid

    (b)

    n-Hexanol

    (c)

    Phenol

    (d)

    Both (A) and (c)

  12. Toluene is oxidised by acidified KMnO4 to

    (a)

    salicylic acid

    (b)

    benzyl alcohol

    (c)

    benzaldehyde

    (d)

    benzoic acid

  13. The carbonyl carbon is ________ hybridised.

    (a)

    sP

    (b)

    sP2

    (c)

    sP3

    (d)

    dsP2

  14. With respect to the reagents given below, pick out the odd one _________.

    (a)

    P2O3

    (b)

    P2O5

    (c)

    H2SO4

    (d)

    K2Cr2O7

  15. The chain isomer of 2-methyl prop anal is _________.

    (a)

    2-butanone

    (b)

    butanal

    (c)

    2-methyl propanol

    (d)

    but-3ene-2-ol

  16. The hybridisation of carbon in CHO group is ________.

    (a)

    dsp2

    (b)

    sp3

    (c)

    sp2

    (d)

    sp

  17. The acid which reduces Tollen's reagent is _________.

    (a)

    acetic acid

    (b)

    benzoic acid

    (c)

    formic acid

    (d)

    oxalic acid

  18. The compound which undergoes intramolecular dehydration with P2O5 is __________.

    (a)

    acetic acid

    (b)

    formic acid

    (c)

    propionic acid

    (d)

    butyric acid

  19. The IUPAC name of \(CH_{ 3 }-\overset { \underset { | }{ { CH }_{ 3 } } }{ CH } -{ CH }_{ 2 }-COOH\) is ___________.

    (a)

    methyl butanoic acid

    (b)

    2-niethyl butanoic acid

    (c)

    α-methyl butyric acid

    (d)

    3-methyl butanoic

  20. The order of reactivity of carboxylic acid derivatives is _______

    (a)

    Acid chloride > Ester > Amide > Acid anhydride

    (b)

    Acid chloride > Acid anhydride > Ester > Amide

    (c)

    Acid chloride> Amide> Acid anhydride> Ester

    (d)

    Acid anhydride > Ester> Amide> Acid chloride

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