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

(1)

(2)

(3)

(4)

End product (D) in the given sequence is:

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

The major product obtained in the reaction of 1-phenyl-2-bromobutane with NaOMe is :

1. trans-1 -phenylbut-1-ene

2. cis-1-phenylbut-2-ene

3. 1-phenyl-2-ethoxybutane

4. cis-1-phenylbut-2-ene

Identify A:-

1.		2.
3.		4.

Ph-CH-CH2-CH2 →    Product
      l            l    Zn-Cu
     Br          Br     Δ

Product of the above reaction is:-
(1) Ph-CH=CH-CH₂-Br

(2) Ph-◁

(3) PH-CHBr-CH=CH₂

(4) Ph-C$\equiv$ C-CH₃

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

Product (A) is:

1.

2.

3.

4.

Consider the following reaction,



The product is :

1. a primary amine

2. a tertiary amine

3. a secondary amine

4. a quaternary ammonium salt

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