The sequence of steps involved in aromatic nucleophilic substitution involving a benzyne intermediate is

1.  Addition-elimination

2.  Elimination-addition

3.  Addition-rearrangement

4.  Elimination-rearrangement

Levonorgestrel is a commonly used contraceptive. The number of chiral centers present in this molecules are

1.  4

2.  5

3.  6

4.  7

The increasing reactivity of the sites (a-d) in the following compound in ${\mathrm{S}}_{\mathrm{N}}1$ reaction is

1.  d > b > c > a

2.  d > c > a > b

3.  d > c > b > a

4.  c > d > b > a

Pairs of functional isomers  possible of molecular formula C₄H₁₀O are:

1. 2

2. 4

3. 8

4. 12

Which type of structure(s) is/are possible for C₃H₆O?

1. Cyclic alcohols

2. Cyclic Ether

3. Ketone

4. All of the above

How many cyclic isomers are possible for molecular formula ${\mathrm{C}}_4{\mathrm{H}}_6$ ?

1. 3

2. 4

3. 5

4. 6

The IUPAC name of  is 

1. 2- Methyl bicyclo [2,2,1] heptane

2. 1- Methyl bicyclo [1,2,2] heptane

3. 1 - Methyl bicyclo [2,2,1] heptane

4. 2 - Methyl bicyclo [1,2,2] heptane

The IUPAC name of  is 

1. Spiro [2,2] pentane

2. Bicyclo [2,2] pentane

3. Bicyclo [2,1,0] pentane

4. Spiro [2,1,0] pentane 

The IUPAC name of   is 

1. Bicyclo [0,1,2] pentane

2. Bicyclo [2,1,0] pentane

3. Bicyclo [1,0,1] pentane

4. Bicyclo [1,0,2] pentane

Maleic and fumaric acids are-

1. Tautomers                 

2. Geometrical isomers

3. Chain isomers             

4. Functional isomers