Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is correct IUPAC name of compound?
$$CH_{3}-CH_{2}-CH=CH_{}-CH_{3}$$

A
Pent-2-ene

B
Prop-1-en-2-yne

C
1-Methylpropane

D
Pen-4-ene

Solution

$$\overset {5}{C}H_{3}-\overset {4}{C}H_{2}-\overset {3}{C}H=\overset {2}{C}H-\overset {1}{C}H_{3}$$

The IUPAC name of the given compound is Pent-2-ene.
Question 2
1 / -0

The name of the following compound is :
$${ CH }_{ 3 }{ CH }_{ 2 }({ CH }_{ 3 }){ CHNH }_{ 2 }$$

A
1-methyl-1-aminopropane

B
2-aminobutane

C
1-aminobutane

D
1-amino-1-methylpropane

Solution

The given compound is :
$$CH_{3}CH_{2}(CH_{3})CHNH_{2}$$
Its IUPAC name is :
1-amino-1-methylpropane
Hence, option D is correct.
Question 3
1 / -0

The correct IUPAC name of the alkyl group,
$$ { CH }_{ 3 }-\overset { \overset { { C }_{ 2 }H_{ 5 } }{ | } }{ CH } -{ CH }_{ 2 }-{ \overset { \overset { { C }_{ 2 }{ H }_{ 5 } }{ | } }{ CH-C } H }_{ 3}$$

A
2-ethyl-3-sec-butyl propyl

B
2,4-diethyl pentane

C
2-ethyl-4-methylhexyl

D
2-methyl-4-ethylexyl

Solution

The correct IUPAC name of the given compound is 2,4-diethylpentane.
Hence, option B is correct.
Question 4
1 / -0

IUPAC name of the compound
$$BrCH_2-CHCl-CHCl_2$$ is

A
$$1-Bromo-2, 3 , 3-trichloropropane$$

B
$$1 , 1 , 2-Trichloro-3-bromopropane$$

C
$$3-Bromo-1, 1 , 2-trichloropropane$$

D
$$Trichlorobromopropane$$

Solution
Question 5
1 / -0

IUPAC nomenclature of
$$H_3C-\overset{\,\,CH_3}{\overset{|}{\underset{CH_3}{\underset{|}{C}}}}-CH=\overset{\,\,\,\,CH_3}{\overset{|}{C}}-CH_3$$

A
2,4,4 - trimethylpent -2-ene

B
2,4,4 - trimethylpent -3-ene

C
2,2,4 - trimethylpent -3-ene

D
2,2,4 - trimethylpent -2-ene

Solution

According to IUPAC,
a. The longest chain contains total 5 carbon atoms so the root word must be "pent".
b. Double bond gets higher priority than the alkyl group. So the numbering should be done in such a way that the double bonded carbons get lower number. There are two methyl groups at the C4 and one methyl group at the C2. So the name of thr compound will be 2,4,4-trimethylpent-2-ene. So the correct answer is A
Question 6
1 / -0

The IUPAC name of $${\text{C}}{{\text{H}}_{\text{3}}} - {\text{CH}}\,{\text{ = }}\,{\text{CH}}\, - {\text{C}} \equiv \,{\text{CH}}$$ is :

A
2-Penten-4-yne

B
1-Penten-3-ene

C
Pent-3-en-1-yne

D
None of these

Solution

According to IUPAC nomenclature,
a. There are total 5 carbon atoms in the backbone chain. So the root word should be Pent.
b. Triple will be given more priority than the double bond. But in the name of the compound "ene" will be written before "yne" irrespective of the priority.
So the name of the compound is Pent-3-en-1-yne. So the correct answer is C
Question 7
1 / -0

IUPAC name of $$ CH_3-C \equiv C-HC-(CH_3)_2 $$

A
4-methyl pent-2-yne

B
1,1- dimethyl-2-butyne

C
2-methyl-4-pentyne

D
4, 4-dimethyl-2-butyne.

Solution
Question 8
1 / -0

What is the IUPAC name of the given compound
$$ { CH }_{ 3 }-\underset { \underset { OH }{ | } }{ CH } -{ CH }_{ 2 }-{ CH }_{ 2 }-{ CH }_{ 2 }-\overset { \underset { | }{ Br } }{ \underset { \overset { | }{ Br } }{ C } } -{ CH }_{ 3 } $$

A
6, 6-Dibromoheptan-2-ol

B
2, 2-dibromoheptan-6-ol

C
6, 6-Dibromoheptan-2-al

D
None of these

Solution
Question 9
1 / -0

The IUPAc name of

A
4,5-Diethylocta-1,4,7-triene

B
4,5-Diethylocta-1,4,6-triene

C
4,5-Dimethylocta-1,4,6-triene

D
4,5-Diethylocta-1,4,6-triyne

Solution
Question 10
1 / -0

The correct name of $$H_3C-CH_2-C\equiv C-CH=CH_2$$ is

A
hex-3-yn-5-ene

B
hex-5-en-3-yne

C
hex-3-yn-1-ene

D
hex-1-en-3-yne

Solution