Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

Which of the functional group from following contains the compound of minimum 3 carbon atoms?

A
-COOH

B
-CHO

C
> C=O

D
-C -O

Solution
Question 2
1 / -0

The IUPAC name of following compound is
$$H_3C-\overset{\overset{\,\,\,\,\,\,\,C_2H_5}{|}}CH-\underset{\underset{\,\,\,\,\,CHO}{|}}CH-CH_3$$

A
3-ethyl-2-methylbutanal

B
2,3 dimethylpentanal

C
2-ethyl 3-methylbutanal

D
2-ethyl-3-methylbutan-3-al

Solution
Question 3
1 / -0

In the detection of carbon, lime water turns
milky due to the formation of:

A
$$CaO$$

B
$$Ca(OH)_{2}$$

C
$$CaCO_{3}$$

D
$$Ca(HCO_{3})_{2}$$

Solution

Carbon dioxide passes through limewater, giving a milky solution. This is due to the insoluble suspension of calcium carbonate formed:

$$ Ca(OH)2(aq) + CO2(g)\rightarrow CaCO3(s) + H2O(l) $$
Question 4
1 / -0

Sodium extract gives blood red colour when treated with $$FeCl_{3}$$. Formation of blood red colour confirms the presence of:

A
only nitrogen

B
only sulphur

C
only halogens

D
both nitrogen and sulphur

Solution

$$Na+N+C+S \rightarrow Na SCN$$
Sodium thiocyanate
$$SCN^- +Fe^{3+}\rightarrow [Fe (SCN)]^{+2}$$
Ferric thiocyanate (Blood-red colour)
It confirms the presence of both $$N$$ and $$S$$.
Question 5
1 / -0

In which of the following molecules all the effects namely inductive, mesomeric and hyperconjugation operate?

A

B

C

D
Question 6
1 / -0

IUPAC name of the above compound is :

A
Bromo methyl benzene

B
Phenyl methyl bromide

C
Benzyl bromide

D
Benzal bromide
Question 7
1 / -0

Which of the following is gemdihalide?

A
$$CH_{3} - CH(Br) - CH_{2}Br$$

B
$$CH_{3} -CHBr_{2}$$

C
$$CH_{3}- CH(Br) -CH_{2} -CH_{2}Br$$

D
$$BrCH_{2} CH_{2}Br$$

Solution

Gem dihalides have halogens attached on the same carbon atom.

$$-\overset{|}{\underset{|}{C}}-\overset{X}{\overset{|}{\underset{X}{\underset{|}{C}}}}-$$

Option B is correct.
Question 8
1 / -0

Which of the following statements is not
applicable to Lassaigne's test?

A
The extra elements (N, S and halogens) are tested as their inorganic salts.

B
During fusion of the organic compound with sodium, $$ Na_{2} S$$ , NaCN and NaX are formed.

C
It can even be used for the detection of hydrogen in the organic compound.

D
It is possible to differentiate between the different halogens.

Solution

Lassaignes test
$$Na+C+N\ \overset{a}{\rightarrow}NaCN$$
$$2Na+S\rightarrow Na_{_{2}}S$$
$$Na+X\ \rightarrow Na_{2}S$$
Option (a) is correct
when s is also present
$$Na+C+N+S\rightarrow NaCNS$$
$$3CNS^{-}+Fe^{^{3}+}\rightarrow Fe(CNS)_{3}$$
Blood red
$$NaSCN+2Na\rightarrow NaCN+Na_{2}S$$
option (b) is correct
for testing halogens
$$AsNo_{3}+Na x\rightarrow Ag\times \downarrow + NaNO_3$$
when X=Cl Agcl (white ppt) soluble in $$NH_{4}OH$$
X=Br AgBr (pate-yellow ppt) partially soluble in$$NH_{4}OH$$
X=I AsI (Dark-yellow ppt) is soluble in $$NH_{4}OH$$
option (D) is correct.

It cant be used for the detection of hydrogen in the organic compound.
So the answer is the option(C).
Question 9
1 / -0

Which of the following elements in an organic
compound cannot be detected by Lassaigne's
test?

A
N

B
S

C
Cl

D
H

Solution

Lassaigne's test is used to detect the presence of elements: Nitrogen (N), Sulfur (S), Chlorine (Cl), Bromine (Br) and Iodine (I).
Question 10
1 / -0

In sodium extract nitrogen is present as:

A
sodamide

B
sodium cyanide

C
sodium nitrite

D
sodium nitrate

Solution

In sodium extract nitrogen is present as sodium cyanide.
$$Na+C+N \overset{\Delta }{\rightarrow} NaCN$$