Introduction to Alkynes

Q.

Given below are two statements:

Statement 1: A mixture of chloroform and aniline can be separated by simple distillation.

Statement 2: When separating aniline from a mixture of aniline and water by steam distillation aniline boils below its boing point.

In the light of the above statements , choose the most appropriate answer from the options given below :

1. Statement 1 is true , statement 2 is false

2. Both statement 1 and statement 2 are true

3. Both statement 1 and 2 are false

4. Statement 1 is false , statement 2 is true

Q. A mixture of acetone and methanol can be separated by

1. Steam distillation
2. Vacuum distillation
3. Fractional distillation
4. Sublimation

Q.

How can we separate Benzene and toluene?

Q. Simple distillation can be used to separate:

1. a mixture of benzene (B.P- $80{}^{\circ }C$) and toluene (B.P-$110{}^{\circ }C$)
2. a mixture of ether (B.P- $35{}^{\circ }C$) and toluene (B.P-$110{}^{\circ }C$)
3. a mixture of ethanol (B.P- $78{}^{\circ }C$) and water (B.P-$100{}^{\circ }C$)
4. solid substances

Q. The principle behind fractional distillation technique in the separation of two liquids is:

1. Difference in their melting point
2. Difference in their boiling point
3. Difference in their concentration
4. Difference in their solubilities

Q.

State the technique used for separating the following mixture:
Petrol from crude oil

Q. If the boiling point difference between the two liquids is not much, the ____ method is used to separate them.

1. Simple distillation
2. Distillation under reduced pressure
3. Steam distillation
4. Fractional distillation

Q. Correct reactivity order towards electrophilic addition reaction is:

1. a > b
2. b > a
3. a = b
4. can not predict

Q.

Is it possible to separate a mixture of Ethanol and Toluene by distillation?

Q. Which of the following statements correctly describes the general reactivity of alkynes?

1. Alkynes are more reactive than alkenes
2. In alkynes, $\pi$-electrons are loosely held, electrophilic attack occur here.
3. Alkyne reacts as an electrophile
4. Unlike alkenes, alkynes do not undergo electrophilic addition reaction

Q. Which of the following gases is used for welding

1. methane
2. Ethane
3. Acetylene
4. Ethene

Q. Alkynes are less reactive than alkenes towards addition of $B{r}_2$ because.

1. 
2. 
3. Both are equally stable
4. Original statement is incorrect

Q. Find the odd one out.

1. Aromatic
2. Alkanes
3. Alkynes
4. Alkenes

Q.

Enumerate any two differences between simple distillation and fractional distillation

Q.

The separation of liquids by fractional distillation is based on the difference in their _________.

Q. Dihydrogen can be used :

1. as rocket fuel
   
2. in preparation of ammonia
3. in fuel cells for generating electrical energy
   
4. All of the above.

Q.

Ethanol can be separated from a mixture of ethanol and water by a separating funnel.

1. True
2. False

Q.

How can we separate a mixture of sand, petrol, and kerosene?

Q. An ___ can be defined as a non-ideal solution whose vapour composition is same as its liquid.

Q.

Picture-based question.

Look at the picture and answer the following questions.

1. What is the apparatus used for?

2. Label the components A, B and C.

3. What kind of mixture is separated into its components using this method?

Q.

Majority of the reactions of alkynes are the examples of _____. a. Addition reaction b. Redox Reaction c. Single Replacement Reaction d. Double Replacement Reaction

1. Addition reaction

2. Redox Reaction

3. Single Replacement Reaction

4. Double Replacement Reaction

Q. Which of the following regarding fractional distillation is true?

1. Fractional distillation method is used if difference in boiling points of two liquids is large
2. It has same experimental setup like simple distillation but high temperature is used
3. None of the above
4. It uses a fractionating column

Q. Simple distillation is effective only when the:

1. liquid boiling points are too close
2. liquids have very low boiling points
3. liquid boiling points differ greatly
4. liquids are heat sensitive

Q.

What is the difference between simple distillation and fractional distillation?

Q. Which of the following best defines fractional distillation :

1. Fractional distillation method is used if difference in boiling points of two liquids is not much and uses a fractionating column
2. Fractional distillation method is used if difference in boiling points of two liquids is very high
3. Purifying a sample that is contaminated with minerals
4. None of these

Q.

Hydrogen is used for welding purposes in the form of oxy-hydrogen flame.

1. True
2. False

Q. Write the IUPAC names of following compound

Q. $C{H}_{3}COC{H}_{2}COC{H}_3$

Q. A mixture of oxygen and ethyne is burnt for welding. Why a mixture of ethyne and air is not used?

1. ethene can not burn in air
2. incomplete combustion takes place
3. none of these
4. ethene burn in air with explosion

Q. Which statement explains why oxygen can be separated from nitrogen by the fractional distillation of liquid air?

1. Oxygen is more dense than nitrogen
2. Oxygen is more reactive than nitrogen
3. The two elements have different boiling points
4. The two gases are in different groups of the Periodic Table