Dehalogenation of Vicinal Dihalide

Q. When ethylene bromide is treated with Zn, we get

1. Alkane
2. Alkyne

3. Alkene

4. All

Q. Identify the product D in the following series of reaction
$C{H}_{3}COOH\stackrel{LiAl{H}_4}{\to }A\underset{443K}{\overset{H^{+}}{\to }}B\stackrel{B{r}_2}{\to }C\underset{KOH}{\overset{alc.}{\to }}D$

1. Alcohol
2. Acetylene
3. Methane
4. Benzaldehyde

Q. $C{H}_3-C{H}_2-\stackrel{Cl}{\stackrel{|}{C}}H-C{H}_3\stackrel{alc.KOH}{\to }\left(A\right)$
The major product 'A' is:

1. $C{H}_3-C{H}_2-CH=C{H}_2$
2. 
3. 
4. All in equal amount

Q. Predict a dihalide which gives ethene by treating with Zn dust under suitable conditions.

1. 2, 4-dibromo-3-methylpentane
2. 1, 2-dibromoethane
3. 1, 4-dibromomethylpentane
4. 1, 3-dibromo-2-methylbutane

Q. The process through conversion of 2, 3-dibromobutane to 2-butene with Zn dust takes place:

1. Dehydrogenation
2. Dehydrohalogenation
3. Dehalogenation
4. Denaturation

Q. A sample of 2, 3-dibromo-3-methylpentane is heated with zinc dust. Identify which is the structure that represents the organic product formed in the reaction.

1. 
2. 
3. 
4. 

Q. For the given reaction :


Which of the following correctly represents (A) and (B)?

1. (A) is $Zn/Zndust$ , and (B) is 1-bromopropane.
2. (A) is $Zn/Zndust$ , and (B) is propene.
3. (A) is $ZnO$ , and (B) is 1-bromopropane.
4. (A) is $ZnO$ , and (B) is propyne.

Q. Identify $X$ in the following sequence of reactions.

Q. Identify X and Y in the following reaction sequence.

1. $(C{H}_3{)}_{2}CHCHB{r}_2$, $(C{H}_3{)}_{2}C=C{H}_2$
2. $(C{H}_3{)}_{2}CHC{H}_{2}Br$, $C{H}_{3}CH=CHC{H}_3$
3. $(C{H}_3{)}_2\underset{Br}{\underset{|}{C}}HC{H}_3$, $C{H}_{3}CH=CHC{H}_3$
4. $(C{H}_3{)}_{2}CHBrC{H}_{2}Br$, $(C{H}_3{)}_{2}C=C{H}_2$

Q. 1, 2-dibromoethane gives ______ by treating with $Zn$ dust under suitable conditions.

1. ethene
2. ethyne
3. none of the above
4. ethane