Dehydrohalogenation for Alkenes

Q.

When 2-bromobutane reacts with alcoholic KOH, the reaction is called

1. Chlorination

2. Dehydro-halogenation

3. Halogenation

4. Hydrogenation

Q.

Which of the following is least stable carbanion

1. 

2. 

3. 

4. 

Q.

Which one of the following compounds undergoes Dehydrohalogenation to the maximum extent?

1. 

2. 

3. 

4. 

Q. The maximum number of isomeric alkenes with the molecularformulae C4H8, is 1. 2 2. 3 3. 4 4. 5 Aid with explanatio

Q. 11. Which of the following have dipole moment:- 1) 1, 4-dihydroxy benzene 2) 1, 4-benzenedicarbonitrile 3)1, 2-dichloro benzene 4)All

Q.

Which reaction is not correct?

1. Both b and c

2. 

3. 

4. 

Q. A gas formed by the action of alcoholic KOH on ethyl iodide, decolourises alkaline $KMn{O}_4$. The gas is

1. $C_2{H}_6$
   
2. $C{H}_4$
   
3. $C_2{H}_2$
   
4. $C_2{H}_4$

Q. Ethyl bromide gives ethylene when reacted with

1. Ethyl alcohol
2. Dilute $H_{2}S{O}_4$
3. Aqueous KOH
4. Alcoholic KOH

Q. Acetylene reacts with ammonium chloride in presence of cuprous chloride to form :

1. $CuC\equiv CCu$
2. $CH\equiv CCu$
3. $C{H}_2=CHC\equiv CH$
4. $CuC\equiv CN{H}_4$

Q. minimum carbon required for alkane to show position isomerism:

Q. The final product formed when ethyl bromide is treated with excess of alcoholic KOH is

1. Ethylene
2. Ethane
3. Ethyne
4. Vinyl bromide

Q. 2-chlorobutane is heated with alcoholic NaOH, the product formed in larger amount is

1. 1-Butene
2. 1-Butyne
3. 2-Butene
4. All of these

Q.

Which one of the following compounds undergoes Dehydrohalogenation to the maximum extent?

1. 

2. 

3. 

4. 

Q. which of the following groups when attached to benzene ring is moderately deactivating c2h5 och3 NHCOCH3 Br

Q.

The enol form of:

1. 

2. 

3. No enol form exits

4. Both a & b

Q.

A molecule of acetylene contains

1. one σ and two π bonds

2. two σ and two π bonds

3. three σ and two π bonds

4. two σ and three π bonds

Q.

Alkenes could be synthesized by:

1. Dehydration of alcohols

2. Dehydrohalogenation of alkyl halides

3. Wittig olefination

4. All of the above

Q. The final production in following sequence of reaction
$CH\equiv CH\stackrel{NaN{H}_2}{\to }A\stackrel{C{H}_{3}Br}{\to }B$:

1. $C{H}_2=CH-CH=C{H}_2$
2. $HC\equiv C-C{H}_3$
3. $C{H}_2=CH-C{H}_3$
4. $C{H}_3-C{H}_2-C{H}_3$

Q. $H-C\equiv C-H+NaN{H}_2⟶A\stackrel{2moleC{H}_{3}I}{⟶}B$

1. 1-Butyne
2. 2-Butyne
3. 2-Pentyne
4. Propyne

Q. For the given reaction :


Major product (Y) is :

1. 
2. 
3. 
4. 

Q. Which of the following compounds undergoes dehydrochlorination most easily when treated with alcoholic $KOH$ ?

1. 
2. 
3. 
4. 

Q. Which of the bicarbonate does not exist in solid sate?

1. ${KHCO}_3$
2. ${NaHCO}_3$
3. ${Ca\left({HCO}_3\right)}_2$
4. ${RbHCO}_3$

Q.

A molecule of acetylene contains

1. one σ and two π bonds

2. two σ and two π bonds

3. three σ and two π bonds

4. two σ and three π bonds

Q.

The final product formed when ethyl bromide is treated with excess of alcoholic KOH is

1. Ethylene

2. Ethane

3. Ethyne

4. Vinyl bromide

Q.

Which reaction is not correct?

1. 

2. 

3. 

4. Both b and c

Q. The compound B formed in the following sequences of reactions is
$\underset{\underset{propylchloride)}{\left(a\right)}}{C{H}_3-C{H}_2-C{H}_2-Cl}\underset{}{\overset{Alc.KOH}{\to }}\underset{\underset{Propene}{(}b)}{C{H}_3-CH=C{H}_2}$

1. Propyne
2. Propene
3. Propanol
4. Propane

Q. 22. Metal Chlo ride contains 71chlorine.find equivalent wt. Of metal bromide

Q. Consider the following reaction $C{H}_3-\stackrel{\stackrel{C{H}_3}{|}}{\underset{\underset{Br}{|}}{C}}-C{H}_{2}C{H}_3\stackrel{Alc.KOH}{⟶}$

which of the following alkene will be the major product?

1. I
2. II
3. both will be formed in equal amount
4. None of the above

Q. In which of the following reaction, the major product alkene is formed by $E_{1}cB$ mechanism?

1. 
2. 
   $C{H}_{3}C{H}_{2}C{H}_{2}C{H}_2-Br\underset{\Delta }{\overset{alc.KOH}{\to }}$
3. 
4. 

Q.

In this reaction 'A' is

1. 

2. 

3. ​

4.