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Published on: 28/11/2025
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.
Glycerose is a mixture of ______.
glyceric acid + dihydroxy acetone
glyceraldehyde + dihydroxy acetone
glyceraldehyde + glyceric acid
dihydroxy acetone + mesoxalic acid
2.
Which one given below is a non-reducing sugar?
Glucose
Sucrose
maltose
Lactose
3.
Which one of the following is most basic?
2,4 – dichloroaniline
2,4 – dimethyl aniline
2,4 – dinitroaniline
2,4 – dibromoaniline
4.
In the following reaction, \(HC\equiv CH \overset { { H }_{ 2 }{ SO }_{ 4 } }{ \underset { HgS{ O }_{ 4 } }{ \longrightarrow } } X\) Product ‘X’ will not give _______.
Tollen’s test
Victor meyer test
Iodoform test
Fehling solution test
5.
6.
Write the reaction of primary amine with Carbon disulphide (CS2).
7.
Write short notes on the following
v. Carbylamine reaction
8.
Justify the presence of keto group in C2 in fructose.
9.
How will you convert acetylene into n-butyl alcohol.
10.
Identify A, B and C
11.
Write notes on Gomberg reaction.
12.
What is chloropicrin?
13.
What are epimers?
14.
What will be the product (X and A) for the following reaction acetylchloride \(\frac{\text { i) } \mathrm{CH}_{3} \mathrm{MgBr}}{\text { ii) } \mathrm{H}_{3} \mathrm{O}^{+}}{\longrightarrow} \mathrm{X} \stackrel{\text { acid } \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}{\longrightarrow}\) A
15.
Write down the possible isomers of the C4H9NO2 give their IUPAC names.
1.
(b)
glyceraldehyde + dihydroxy acetone
2.
(b)
Sucrose
3.
(b)
2,4 – dimethyl aniline
4.
5.
(c)
6.
7.
Carbylamine reaction :
Aliphatic (or) aromatic primary amines react with: chloroform and alcoholic KOH to give isocyanides (carbylamines), which has an unpleasant smell. This reaction is known as carbylamines test. This test used to identify the primary amines.
\(\underset { Ethylamine }{ { C }_{ 2 }{ H }_{ 5 }-{ NH }_{ 2 } } +\underset { Chloroform }{ { CHCl }_{ 3 }+3KOH } \longrightarrow \underset { Ethylisocyanide }{ { C }_{ 2 }{ H }_{ 5 }-NC } +3KCl+3{ H }_{ 2 }O\)
8.
On oxidation with nitric acid, it gives glycolic acid and tartaric acids which contain smaller number of carbon atoms than in fructose.
This shows that a keto group is present in C-2.
9.
10.
| Compound | Name |
| A | Benzoyl Chloride |
| B | Benzophenone |
| C | Ethylbenzoate |
11.
Benzene diazonium chloride reacts with benzene in the presence of sodium hydroxide to give biphenyl. This reaction in known as the Gomberg reaction.
12.
CCl3 - NO2 (trichloronitro. methane) is Chloropicrin.
13.
Sugar differing in configuration at an asymmetric centre is known as epimers.
14.
15.
| Isomerism | Structural formula of isomers |
| Chain isomerism: They differ in the length of carbon chain. |
.JPG) |
| Position isomerism: They differ in the position of nitro group. |
.JPG) |
| Functional isomerism: Nitroalkanes exhibit functional isomerism with alkylnitrites |
\( \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2}-\mathrm{NO}_{2} \text { and } \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2}-\mathrm{O}-\mathrm{N}=\mathrm{O}\\ \quad 1 - nitrobutane \quad \quad \quad \quad \quad \quad \quad butyl \ nitrite\) |
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