Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 35

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Weekly Quiz Competition

Question 1
1 / -0

Select the product (A) and (B) from the compounds (P) and (Q) given below.

A
A= P, B=P

B
A=Q, B=Q

C
A=Q, B=P

D
A=P, B=Q

Solution

When primary alkyl/aryl halides react with sodium ethoxide, the reaction proceeds by $$SN_{2}$$, i.e., the anionic part of the sodium ethoxide substitutes for the halide.
But when secondary alkyl/aryl halides react with sodium ethoxide, the reaction proceeds majorly by elimination because of the alkyl halide becoming more stearically hindered. Therefore, alkene is formed as a major product.
Question 2
1 / -0

In the presence of an acid or base $$(A)$$ changes to:

A

B

C

D

Solution
Question 3
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Silt in water remains suspended. It is removed by sedimentation and filtration. For increasing its sedimentation aluminium sulphates and calcium hydroxide (slaked lime) are added. As a result sticky aluminium hydroxide.

A
Destroys slit particles

B
Attracts the particles of slit

C
Mixes with slit particles

D
Makes slit particles increases in size and deposit at the bottom

Solution

The silt in $$H_2O$$ remains suspended. To attract some more silt particles, $$Al(OH)_3$$ is used. It is used to absorb the silt particles and make the liquid more pure.
Question 4
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IUPAC name of the following compound:

$${ CH }_{ 3 }-{ CH }_{ 2 }-\underset { CH_2CH_3 }{\underset{|}{ C}H -}C{ H }_{ 2 }-\underset{CH_3}{\underset{|}{C}H}-C{ H }_{ 2 }-C{ H }_{ 3 }$$

A
3-Ethyl-5-methylheptane

B
5-Ethyl-3-methylheptane

C
1,1-Diethyl-3-methylpentane

D
3-Methyl-5,5-diethylpentane

Solution

The given structure formula can be written as:
As per rule numbering will start from the end, giving the lowest number to an ethyl group.
Thus we have,$$Ethyl (C_{2}H_{5})$$ is at number 3 , $$methyl (CH_{3})$$ is at number 5, with a total 7 C in the chain giving heptane.

Thus, its IUPAC will be:

$$3- Ethyl-5-methyl heptane.$$
Thus option A is correct.
Question 5
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The IUPAC name for compound ?

A
1-Chloro-2 nitro-4-methylbenzene

B
1-Chloro-4 methyl-2- nitrobenzene

C
2-Chloro-1 nitro-5- methylbenzene

D
m-nitro-p-chlorotoluene

Solution

(Refer to Image)
$$1-chloro-4-methyl-2-nitrobenzene$$
Question 6
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Correct order of acidic strength is:

A
i > ii > iv > iii

B
iii > iv > ii > i

C
ii > i > iv > iii

D
iv > ii > iii > i

Solution

Here the acidic strength of $$(i)$$ is slightly less than $$(ii)$$ because of $$+M$$ effect in para methoxy benzoic acid than $$+I$$ effect in para methyl benzoic acid
But $$(iv)$$ is most acidic because of powerful electron withdrawing effect of $$NO_{2}$$
$$\therefore (iv) > (ii) > (iii) > (i)$$
Question 7
1 / -0

The process of separation of an organic compound from its aqueous solution by shaking with a suitable solvent is termed solvent extraction or differential extraction.
The organic compound present in aqueous layer moves to the organic solvent because:

A
the organic substance is more soluble in the organic solvent

B
organic compound being lighter moves in the upper layer

C
organic solvent is insoluble in water hence organic compound moves up

D
from the supersaturated aqueous solution the solute starts diffusing

Solution

As the organic solvent is immiscible with aqueous solvent and organic compounds are more soluble in organic solvent so it will distribute more in organic phase than aqueous phase.

So, option A is correct.
Question 8
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The IUPAC name of the compound given is :
$$\underset{\!\!\!\!\!{\displaystyle \text {OH}}}{\underset{|}{C}H_2} - \underset{{\displaystyle \text {NH}}_2}{\underset{|}{C}H} - COOH$$

A
2-amino-3-hydroxypropanoic acid

B
1-hydroxy-2-aminopropan-3-oic acid

C
1-amino-2-hydroxypropanoic acid

D
3-hydroxy-2-aminopropanoic acid

Solution

Answer:-
Since the given compound has a carboxylic acid group as the main group, thus numbering will start from that side.
$$\therefore$$ The correct IUPAC name of the given compound is - 2-amino-3-hydroxypropanoic acid.
Question 9
1 / -0

The synthetic steroid ethynylestardiol (1) is a compound used in the birth control pill.
Which of the following functional group is contained in compound (1)?

A
A ketone

B
An alcohol

C
A carboxylic acid

D
An ester

Solution

In the above compound $$-OH$$ group is present only which is an alcohol group.
Question 10
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Prostaglandin $$E_1$$ 1 is a compound produced by the body to regulate a variety of processes including blood clotting, fever, pain and inflammation.
Which of the following functional groups is not contained in 1 ?

A
A ketone

B
An alcohol

C
A carboxylic acid

D
An alkene

E
A nitrile