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Published on: 13/10/2020
12th Standard Chemistry Carbonyl Compounds English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021
Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
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1.
The most acidic among the following is ________.
p- nitrophenol
p- hydroxybenzoicacid
o- hydroxy benzoic acid
p- toluic acid
2.
Benzoic acid does not undergo Friedel crafts reaction due _________.
resonancein benzene
strong deactivating nature of the carboxyl group
due to its higher pka, value
all the above
3.
Partial reduction of acetic acid in the presence of LiAl H4 results in the formation of ________.
ethane
ethanol
ethene
ethyne
4.
LiAlH4 and NaBH4 are _______.
H+ donor
H- donor
H- acceptor
None
5.
Bakelite is a product of reaction between _______.
formaldehyde and NaOH
phenol and methanal
aniline and NaOH
aniline and NaOH
6.
In the reduction of acetaldehyde using LiAlH4 the hydride ion acts as _______.
electrophile
nucleophile
both (a) and (b)
a free radical
7.
Tincture benzoin is obtained from _______.
benzoyl chloride
benzoin
benzyl alcohol
benzoic acid
8.
Formaldehyde polymerises to give _______.
paraldehyde
paraformaldhyde
formalin
formic acid
9.
Methyl ketones are usually characterised by _______.
the Fehling's solution
the iodoform test
the Schiff's test
the Tollen's reagent
10.
A compound 'X' when mixed with ethanol and a drop of concentrated H2SO4 gave a compound with fruity odour. Identify 'X'.
HCHO
CH3OH
CH3COOH
CH3NH2
11.
Identify 'X'.
12.
Cannizaro reaction is not given by _______.
CH3CHO
HCHO
13.
Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their ________.
more extensive association of carboxylic acid via van der Waals force of attraction
formation of carboxylate ion
formation of intramolecular H-bonding
formation of intermolecular H – bonding
14.
The reagent used to distinguish between acetaldehyde and benzaldehyde is _______.
Tollens reagent
Fehling’s solution
2,4 – dinitrophenyl hydrazine
semicarbazide
15.
Which one of the following reaction is an example of disproportionation reaction.
Aldol condensation
cannizaro reaction
Benzoin condensation
none of these
16.
In which case chiral carbon is not generated by reaction with HCN?
17.
The IUPAC name of
but – 3- enoicacid
but – 1- ene-4-oic acid
but – 2- ene-1-oic acid
but -3-ene-1-oicacid
18.
Which of the following represents the correct order of acidity in the given compounds
FCH2COOH > CH3COOH > BrCH2COOH > ClCH2COOH
FCH2COOH > ClCH2COOH > BrCH2COOH > CH3COOH
CH3COOH > ClCH2COOH > FCH2COOH > Br-CH2COOH
Cl CH2COOH > CH3COOH > BrCH2COOH > ICH2COOH
19.
Predict the product Z in the following series of reactions Ethanoic acid \(\overset { { PCI }_{ 5 } }{ \longrightarrow } X\overset { { C }_{ 6 }{ H }_{ 6 } }{ \underset { Anhydrous \ AlCI }-_{3}{ \longrightarrow } } Y\overset { 1){ CH }_{ 3 }MgBr }{ \underset { II){ H }_{ 3 }{ O }^{ + } }{ \longrightarrow } } Z.\)
(CH3)2 C(OH)C6H5
CH3CH(OH)C6H5
CH3CH(OH)CH2- CH3
20.
1.
(c)
o- hydroxy benzoic acid
2.
(b)
strong deactivating nature of the carboxyl group
3.
(b)
ethanol
4.
(b)
H- donor
5.
(b)
phenol and methanal
6.
(b)
nucleophile
7.
(b)
benzoin
8.
(b)
paraformaldhyde
9.
(b)
the iodoform test
10.
(c)
CH3COOH
11.
(c)
12.
(c)
CH3CHO
13.
(d)
formation of intermolecular H – bonding
14.
(b)
Fehling’s solution
15.
(b)
cannizaro reaction
16.
17.
18.
- I etiect increases the acidity. If electronegativity is high, - I effect is also high.
19.
20.
(d)
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