Which one of the following compound will be least susceptible to elimination of hydrogen bromide ?
(1) Br-CH₂-CH₂-NO₂

(2) Br-CH₂-CH₂-CH3

(3) Br-CH₂-CH₂-CN

(4) Br-CH₂-CH₂-Co₂Et

 

Two alkenes, X(91% yield) and Y(9% yield) are formed when the following compound is heated.

The structures of X and Y, respectively are:

1. 

2. 

3. 

4. 

In the dehydrohalogenation of 2-bromobutane; which conformation leads to the formation of cis-2-butene ?

(1)

(2)

(3)

(4)

Find the total number of moles (x + y) of NaNH₂ and CH₃I required, respectively,
to carry out the following conversion, as represented in the given reaction.

CH₃–CBr₂–CBr₂–CH₃ → CH₃–C≡C–C≡C–CH₃

Reagents: x mol NaNH₂ and y mol CH₃I

 1. 5 moles
 2. 6 moles
 3. 7 moles
 4. 8 moles

Identify A:-

1.		2.
3.		4.

$\underset{\mathrm{EtOH},∆}{\overset{\mathrm{KOH}}{\to }}\underset{\left(major\right)}{\left(A\right)}$

Product (A) is:

1.

2.

3.

4.

Br                  Br
 l                    l   
CH2-CH=CH-CH2→(A)
                       Zn(dust)

Above reaction is an example of 1,4-elimination.Predict the product.
(1) CH₃-CH=C=CH₂
(2) CH₃-C$\equiv$C-CH₃
(3) CH₃-CH₂-C$\equiv$CH
(4) H₂C=CH-CH=CH₂

Which is the major product expected from the following S_N² reaction?

1.      

2.     

3.     

4.    

Arrange the following alkyl bromides in decreasing order of their rate of E2 elimination under identical conditions:

(a)
(b)
(c)

Compare rate of E₂ reaction:-
1. c>b>a

2. a>b>c

3. b>a>c

4. c>a>b