12th Standard Syllabus & Materials
12th Standard
TN 12th Computer Applications மின்னணு தரவு பரிமாற்றம் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications மின் - வணிக பாதுகாப்பு அமைப்புகள் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A
Published on: 13/10/2020
12th Standard Chemistry Hydroxy Compounds and Ethers English Medium Free Online Test One Mark Questions 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.
Questions + Answers key
Take MCQ Chemistry Test
1.
Identify the major product in the given reaction
2.
When alcohols are converted to alkyl chlorides by thionyl chloride in presence of pyridine the intermediate formed is ______.
sulphonium ion
chlorosulphonic acid
alkyl chlorosulphite
chlorosulphite
3.
Ethylene diamine is converted to ethylene glycol using ______.
Na2CO3 solution
Nitrous acid
NaHCO3 (aqueous)
Baeyer's reagent
4.
p-Nitrophenol is having lower pKa value than phenol because ______.
phenol is more acidic than p-nitro phenol
anion of p-nitro phenol is more stabilised by resonance than that of phenol.
degree of ionisation of p-nitro phenol is less than that of phenol
anion of p-nitro phenol is less stable than that of phenol.
5.
The ionization constant of phenol is higher than that of ethanol because ______.
phenoxide ion is bulkier than ethoxide
phenoxide ion is stronger base than ethoxide.
phenoxide ion is stablized through delocalisation.
phenoxide ion is less stable than ethoxide ion.
6.
Which is soluble in H2O?
Phenol
Alkanes
Alcohols
Alkenes
7.
Which among the following sets of reactants will produce anisole?
HCHO, RMgX
C6H5ONa, CH3Br
C6H5CH3, CH3CoCI
8.
Glycol \(\overset { 773K }{ \longrightarrow } \) 'A'. Identify 'A' _______.
\(\overset { { CH }_{ 3 } }{ \underset { CHO }{ | } } \)
9.
Which among the following reagent is not used to differentiate ethanol and phenol?
neutral FeCl3
C6H5N2CI
NaOH
anhy ZnCl2
10.
Which one of the alcohol cannot be prepared by grignard reagent?
Methanol
ethanol
iso propyl alcohol
phenyl methanol
11.
Which among the following alkene on acid hydration will produce tertiary butyl alcohol?
\({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ C } ={ CH }_{ 2 }\)
CH3-CH=CH2
\({ CH }_{ 3 }-\underset { \overset { || }{ { CH }_{ 2 } } }{ CH } \)
CH3-CH2-CH=CH-CH3
12.
On reacting with neutral ferric chloride, phenol gives ______.
red colour
violet colour
dark green colour
no colouration.
13.
Among the following ethers which one will produce methyl alcohol on treatment with hot HI?
(H3C)3C-O-CH3
(CH3-)2-CH-CH2-O-CH3
CH3-(CH2)3-O-CH3
CH3-CH2-\(\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } \)-O-CH3
14.
The reactions
is an example of ______.
Wurtz reaction
cyclic reaction
Williamson reaction
Kolbe reactions
15.
HO CH2 CH2 – OH on heating with periodic acid gives ______.
methanoic acid
Glyoxal
methanol
CO2
16.
Carbolic acid is _____.
Phenol
Picri cacid
benzoic acid
phenylacetic acid
17.
18.
The X is _______.
None of these
19.
An alcohol (x) gives blue colour in victormayer’s test and 3.7g of X when treated with metallic sodium liberates 560 mL of hydrogen at 273 K and 1 atm pressure what will be the possible structure of X?
CH3 CH (OH) CH2CH3
CH3 – CH (OH) – CH3
CH3 – C (OH) – (CH3)2
CH3- CH2 –CH (OH) – CH2 – CH3
20.
Assertion: Phenol is more acidic than ethanol
Reason: Phenoxide ion is resonance stabilized
Codes:
a) both assertion and reason are true and reason is the correct explanation of assertion.
b) 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.
if both assertion and reason are true and reason is the correct explanation of assertion.
if both assertion and reason are true but reason is not the correct explanation of assertion.
assertion is true but reason is false
both assertion and reason are false.
1.
(c)
2.
(c)
alkyl chlorosulphite
3.
(b)
Nitrous acid
4.
(b)
anion of p-nitro phenol is more stabilised by resonance than that of phenol.
5.
(c)
phenoxide ion is stablized through delocalisation.
6.
(c)
Alcohols
7.
(c)
C6H5ONa, CH3Br
8.
(a)
9.
(d)
anhy ZnCl2
10.
(a)
Methanol
11.
(a)
\({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ C } ={ CH }_{ 2 }\)
12.
(b)
violet colour
13.
14.
(c)
Williamson reaction
15.
(c)
methanol
16.
(a)
Phenol
17.
(c)
18.
Hydroboration - Anti Markownikoff product
CH3 – CH2 –CH2 – CH2 – CH2 – OH
19.
CH3 CH (OH) CH2CH3
2R-OH+ 2Na ⟶ 2RONa + H2 ↑
2 moles of alcohol gives 1 mole of H2 which occupies 22.4 L at 273 K and 1 atm number of moles of alcohol
= 2 moles of R -OH/22.4L of H2 x 560 ml
= 0.05 moles
No of moles = mass/molar mass = m/M
= 3.7/0.05 = 74 g mol-1
General formula for (R-OH) Cn H2n + 1OH
n(12) + (2n + 1) (1) + 16 + 1 = 74
14n = 74 - 18
14n = 56
n = 56/14 = 4
The "2" alcohol which contains 4 carbon is CH3 - CH (OH) CH2 - CH3
20.
a) both assertion and reason are true and reason is the correct explanation of assertion.
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