Isomerism MCQ Questions & Answers in Organic Chemistry | Chemistry
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31.
The compound which is not isomeric with diethyl ether is
A
$$n - $$ propyl methyl ether
B
butan $$ - 1 - ol$$
C
$$2 - $$ methylpropan $$ - 2 - ol$$
D
butanone
Answer :
butanone
The first three are isomers of diethyl ether, $${C_2}{H_5}O{C_2}{H_5}\,\left( {{C_4}{H_{10}}O} \right).$$
32.
Which of the following compounds is isomeric with 2, 2, 4, 4-tetramethylhexane?
34. and $${C_2}{H_5} - O - N = O$$ are examples of
A
functional isomers
B
tautomers
C
position isomers
D
metamers
Answer :
functional isomers
No explanation is given for this question. Let's discuss the answer together.
35.
What is the minimum number of carbon atoms of an alkane must have to form an isomer?
A
4
B
3
C
2
D
1
Answer :
4
The first member of alkane group is butane which can form isomers.
\[\begin{align}
& \underset{n\text{-butane}}{\mathop{C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{3}}}}\, \\
& \underset{\text{2-Methylpropane}}{\mathop{C{{H}_{3}}-\overset{\begin{smallmatrix}
\,\,C{{H}_{3}} \\
|\,\,\,\,
\end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{3}}}}\, \\
\end{align}\]
36.
Which of the following will have a mesoisomer also?
A
2, 3 - Dichloropentane
B
2, 3 - Dichlorobutane
C
2 - Chlorobutane
D
2 - Hydroxypropanoic acid
Answer :
2, 3 - Dichlorobutane
NOTE : The compounds containing two similar assymmetric $$C - $$ atoms have plane of symmetry and exist in Meso form.
37.
What is the relationship between the structures shown?
A
Structural isomers
B
Geometrical isomers
C
Conformational structures
D
Identical structures
Answer :
Conformational structures
No explanation is given for this question. Let's discuss the answer together.
38.
In which of the following, functional group isomerism is not possible?
A
Alcohols
B
Aldehydes
C
Alkyl halides
D
Cyanides
Answer :
Alkyl halides
In alkyl halides, functional group isomerism is not possible. Alcohols and ethers; aldehydes and ketones; cyanides and isocyanides are functional group isomers.
39.
A similarity between optical and geometrical isomerism is
that
A
each forms equal number of isomers for a given
compound
B
if in a compound one is present then so is the other
C
both are included in stereoisomerism
D
they have no similarity.
Answer :
both are included in stereoisomerism
Sterioisomerism involve those isomers which contain same ligands in their co-ordination spheres but differ in the arrangement of these ligands in space. Stereoisomerism is of two type geomerical isomerism and optical isomerism. In geomerical isomerism ligands occupy different positions around the central metal atom or ion.
NOTE : In optical isomerism isomers have same formula but differ in their ability to rotate directions of the plane of polarised light.
40.
Which of the following compound has plane of symmetry ?
A
B
C
D
Answer :
Consider
no plane can pass in such a way that molecule has symmetry.
Similarly for