Isomerism Test

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Isomerism Test - 19

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Question 1
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Direction (Q. Nos. 1-8) This section contains 8 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.

Q.
how many structural isomers (aldehyde + ketone) are possible for C₅H₁₀O ?

A
3

B
4

C
6

D
7

Solution

We can see that for alkane, we atleast need alkane of 7 carbon atoms or C₇H₁₆.
Question 2
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An organic acid containing carbon, oxygen and hydrogen only has molar mass of 132 g. 6.6 g of this acid require 80 mL 1.25 M NaOH for complete neutralisation. How many carboxylic groups are present in one molecule of this acid?

A
1

B
2

C
3

D
4

Solution

Let us consider organic acid as ‘A’.
Moles of A = mass of A/Molar mass = 6.6/132 = 0.05
Molarity of NaOH = 1.25M
And volume of NaOH = 80 mL
Therefore, moles of NaOH = molarity × Volume
= 1.25×80×10^-3 = 0.1 moles.
SO, 0.05 moles of A requires 0.1 moles of NaOH
1 mole of acid requires x moles of NaOH
x = 0.1/0.05×1 = 2
So for neutralisation of 1 mole of A, we need 2 moles of NaOH. Therefore given acid is dibasic and contains 2 -COOH groups.
Question 3
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An organic compound containing carbon, hydrogen and oxygen has molar mass 100. How many structural isomers satisfy this condition which are also simultaneously ketones?

A
5

B
6

C
7

D
8

Solution

General formula
C_nH_2nO = 100
12×n+2×2n+16 = 100
n = 6
So, the formula of ketone is C₆H₁₂O

So, according to me, the correct answer is 6 and not 8.
Question 4
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Only two isomers of monochloro product is possible of

A
n-butane

B
2,4-dimethyl pentane

C
Benzene

D
1-methyl propane

Solution
Question 5
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Which of the following compounds will exhibit cis-trans isomerism?

A
2-butene

B
2-butyne

C
2-butanol

D
butanal

Solution

The correct answer is Option A.
2-butene can show geometrical isomerism, due to different atoms/group of atoms attached on both sides of double bonded carbons as H and CH3 − groups.
Question 6
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An organic compound has three ether isomers and it is the smallest ether which satisfy this condition. Which of the following is true regarding this compound?

A
Only one alcohol isomer exist

B
Four alcohol isomers exist and they are all constitutional isomers

C
Five alcohol isomers exist and they are positional isomers of each other

D
Molecular formula of the compound is C₅H₁₂O

Solution

We know that for ether, we need C-O-C connectivity. Now, we can see that this arrangement won't give any isomer.So, we will increase one carbon atom.
We will get C-C-O-C. This also doesn’t give any isomer. SO we will add another carbon atom. This time, we will have C-C-C-O-C. With this arrangement, we can have 3 different isomers. They are :-
So, we havegeneral fomula as C₄H₉OH. The different constitutional isomers of this lcohol are as follow

We can see that there are 4 isomers of ths compound So option b is correct.
Question 7
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How many structural isomers exist for C₇H₈0 where each isomer contain a phenyl ring?

A
3

B
4

C
5

D
6

Solution

First, we will check the Double bond equivalent. In C₇H₈O, DBE = 4,this means that we will have 3 double bonds and a ring and no additional double bond outside the ring.

These are the structural isomers that exists for C₇H₈O
Question 8
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How many amide isomers are possible for C₄H₉ON ?

A
4

B
5

C
6

D
8

Solution

These are 8 isomers of C₄H₉ON.
Question 9
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Direction (Q. Nos. 9 and 10) Choice the correct combination of elements and column I and coloumn II are given as option (a), (b), (c) and (d), out of which ONE option is correct.

Q.

Column I has some molecular formula and Column II has some organic functional groups. Match the functional group from Column II with the formula from Column I that may contain this functional group. Additional functional groups may also be present. There may also be more than one same functional groups present.

Codes

A
a

B
b

C
c

D
d
Question 10
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Match the formula from column I with their possible identity from Column II
Codes

A
a

B
b

C
c

D
d