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Test: Structural Isomerism - 2


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18 Questions MCQ Test Chemistry Class 11 | Test: Structural Isomerism - 2

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Test: Structural Isomerism - 2 - Question 1

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 ?

Detailed Solution for Test: Structural Isomerism - 2 - Question 1

We can see that for alkane, we atleast need alkane of 7 carbon atoms or C7H16.

Test: Structural Isomerism - 2 - Question 2

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? 

Detailed Solution for Test: Structural Isomerism - 2 - Question 2

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.

Test: Structural Isomerism - 2 - Question 3

An organic compound containing carbon, hydrogen and oxygen has molar mass 100. How many structural isomers satisfy this condition which are also simultaneously ketones? 

Detailed Solution for Test: Structural Isomerism - 2 - Question 3

General formula
CnH2nO = 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.

Test: Structural Isomerism - 2 - Question 4

 Only two isomers of monochloro product is possible of    

Detailed Solution for Test: Structural Isomerism - 2 - Question 4

Test: Structural Isomerism - 2 - Question 5

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

Detailed Solution for Test: Structural Isomerism - 2 - Question 5

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.

Test: Structural Isomerism - 2 - Question 6

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? 

Detailed Solution for Test: Structural Isomerism - 2 - Question 6

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.

Test: Structural Isomerism - 2 - Question 7

How many structural isomers exist for C7H80 where each isomer contain a phenyl ring? 

Detailed Solution for Test: Structural Isomerism - 2 - Question 7

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

Test: Structural Isomerism - 2 - Question 8

How many amide isomers are possible for C4H9ON ?

Detailed Solution for Test: Structural Isomerism - 2 - Question 8


These are 8 isomers of C4H9ON.

*Multiple options can be correct
Test: Structural Isomerism - 2 - Question 9

Direction (Q. Nos. 9-12) This section contains 4 multiple choice questions. Each question has four
choices (a), (b), (c) and (d), out of which ONE or  MORE THANT ONE  is correct.

Q.

Organic compound with molecular formula C2H4O2 can have which of the functional isomer(s)?

Detailed Solution for Test: Structural Isomerism - 2 - Question 9

The correct answer is option A,B
Functional groups having two oxygen atoms are " Easter " and " Carboxylic Acids " .
Compounds having molecular formula C2H4O2 have possible functional isomers. One is ethanoic acids or acetic acids ( Carboxylic Acids ) and other is METHYL Methanoate ( Ester ) ...
Acetic acids are colourless liquid organic compounds with the chemical formula CH3COOH ( also written as CH3CO2H or C2H4O2 ) .

*Multiple options can be correct
Test: Structural Isomerism - 2 - Question 10

The correct statement(s) about structural isomers of compounds having chemical composition C5H12O is/are 

Detailed Solution for Test: Structural Isomerism - 2 - Question 10


All the 8 isomers of alcohol are intermolecular H-bonding. 
There are 6 ethers which have H-bond acceptor(i.e O atm) but not H-bond donor(i.e H atom)  
Also, the isomer with 4 methyl groups is mentioned above.
According to me, CH3CH2COCH2CH3 is metamer of CH3COCH2CH2CH3 OR CH3COCH(CH3)2
So all options are correct.

*Multiple options can be correct
Test: Structural Isomerism - 2 - Question 11

What is/are correct deduction regarding compounds with their composition C3H60?

*Multiple options can be correct
Test: Structural Isomerism - 2 - Question 12

Which of the following on adding one molecule of hydrogen (H2) per molecule of the compound can result in compound capable of exhibiting stereoisomers? 

Detailed Solution for Test: Structural Isomerism - 2 - Question 12


So, option a, b and d are correct.

Test: Structural Isomerism - 2 - Question 13

Direction (Q. Nos. 13 and 14) 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

     

Test: Structural Isomerism - 2 - Question 14

Match the formula from column I with their possible identity from Column II

Codes 

       

*Answer can only contain numeric values
Test: Structural Isomerism - 2 - Question 15

Direction (Q. Nos. 15-18) This section contains 4 questions. when worked out will result in an integer from 0 to 9 (both inclusive)

Q.
 

How manyisomers, each contaning a phenyl ring, are possible for C9H12 ?


Detailed Solution for Test: Structural Isomerism - 2 - Question 15

Double bond equivalent = 20-12/4 = 4
For phenyl ring, Double bond equivalent = 4(3 double bond and 1 ring)
So, we won’t have any double bond outside the ring.

*Answer can only contain numeric values
Test: Structural Isomerism - 2 - Question 16

How many positional isomers exist for C3H5Cl3 ?


Detailed Solution for Test: Structural Isomerism - 2 - Question 16

Explanation:

1,1,1-trichloropropane;

1,2,3-trichloropropane;

1,2,2-trichloropropane;

1,1,2-trichloropropane; this has 2 stereoisomers, with the chiral centre at C2;

1,1,3-trichloropropane;

*Answer can only contain numeric values
Test: Structural Isomerism - 2 - Question 17

How many enols (mono plus dienols only) excluding stereomers are possible for heptane-2,4-dione? 


*Answer can only contain numeric values
Test: Structural Isomerism - 2 - Question 18

How many ester isomers are possible for compound with molecular formula C5H10O2


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