Dehydrohalogenation for Alkenes

Q.

Give the method of preparation of ethyne from 1, 2-dibromoethane.

Q. (a) Draw the structural formula of a compound with two carbon atoms in each of the following cases:
(i) An alkane with a carbon to carbon single bond.
(ii) An alcohol containing two carbon atoms.
(iii) An unsaturated hydrocarbon with a carbon to carbon triple bond.

(b) Ethane, Ethene, Ethanoic acid, Ethyne, Ethanol
From the compounds given above, name:
(i) The compound with —OH as a part of its structure.
(ii) The compound with —COOH as a part of its structure.
(iii) Homologue of Homologous series with general formula C_nH_2n.

Q. Dehydrohalogenation of alkyl halides leads to the formation of .

1. alcohols
2. alkenes
3. alkanes

Q. Why and how does unsaturated compounds discharge the pink colour of alkaline KMnO_​​​4 ?

Q. Why lower alkanes do not undergo Nitration and sulphonation reactions ?

Q.

Which halogen cannot replace any other halogen from their compounds?

Q.

Write the equation for the laboratory preparation of ethene from iodoethane.

Q. How is ethene prepared by:
(a) dehydrohalogenation reaction
(b) dehydration reaction?
Given equations and name the products formed.

[2 MARKS]

Q.

How is ethene prepared by :
(a) dehydrohalogenation reaction?
(b) dehydration reaction?
Give equations and name the products formed.

Q.

Predict the order of reactivity of the following compounds in dehydrohalogenation.

1. IV > III > V > III > I

2. I > II > III > IV > V

3. V > III > II > IV > I

4. V > IV > III > II > I

Q. Why and what is role of organic peroxide in preparing haloalkane from sulphuryl chloride and alkanes

Q.

what is dehalogenation?give an example?

Q. Kerosene oil is a mixture of hydrocarbons which contains the number of carbon atoms is:

1. $C_6$ to $C_{10}$
2. $C_8$ to $C_{12}$
3. $C_{11}$ to $C_{16}$
4. $C_{18}$ to $C_{22}$

Q. In Williamson's synthesis, ethoxyethane is prepared by

1. Passing ethanol over heated alumina
2. Ethyl alcohol with sulphuric acid
3. Sodium ethoxide with ethyl bromide
4. Ethyl iodide and dry silver oxide

Q. Dehydrohalogenation of alkyl halides is a common preparation method of:

1. alkenes
2. alkanes
3. haloalkenes
4. both A and B

Q. Match the names of the reactions with their representation.

1. A + B → C
2. AB + CD → AD + CB
3. A → B + C
4. AB + C → A + CB

Q. How many gram of ethanol is required in the reaction with $Na$ metal in order to give $560ml$ dihydrogen gas at STP?

1. $11.5$
2. $1.15$
3. $4.6$
4. $2.3$