Dehalogenation of Haloforms

Q. Which of the following reaction will give an alkyne?

1. $\text{Potassium fumarate}\stackrel{\text{Electrolysis}}{\to }$
2. $C{H}_{3}CB{r}_{2}CHB{r}_2\stackrel{\text{Zn dust}}{\to }$
3. $C{H}_{3}C{H}_{2}CHB{r}_2\stackrel{alc.KOH/NaN{H}_2/\Delta }{\to }$
4. $C{H}_{3}CHBrC{H}_{2}Br\stackrel{NaN{H}_2/\Delta }{\to }$

Q. Which one of the following compound is not formed in the 'catalytic cracking' of octane?

1. Pentane
2. Butene
3. Propene
4. Hydrogen gas

Q. Which of the following reaction will give an alkyne?

1. $\text{Potassium fumarate}\stackrel{\text{Electrolysis}}{\to }$
2. $C{H}_{3}CB{r}_{2}CHB{r}_2\stackrel{\text{Zn dust}}{\to }$
3. $C{H}_{3}C{H}_{2}CHB{r}_2\stackrel{alc.KOH/NaN{H}_2/\Delta }{\to }$
4. $C{H}_{3}CHBrC{H}_{2}Br\stackrel{NaN{H}_2/\Delta }{\to }$

Q.

Alkynes could be synthesized by:

1. Dehalogenation of tetrahalides

2. Dehydrohalogenation of dihalides

3. Hydrolysis of some carbides

4. All of the above

Q.

Alkynes could be synthesized by:

1. Hydrolysis of some carbides

2. Dehalogenation of tetrahalides

3. Dehydrohalogenation of dihalides

4. All of the above

Q. Which of the following reaction will give an alkyne?

1. $\text{Potassium fumarate}\stackrel{\text{Electrolysis}}{\to }$
2. $C{H}_{3}CB{r}_{2}CHB{r}_2\stackrel{\text{Zn dust}}{\to }$
3. $C{H}_{3}C{H}_{2}CHB{r}_2\stackrel{alc.KOH/NaN{H}_2/\Delta }{\to }$
4. $C{H}_{3}CHBrC{H}_{2}Br\stackrel{NaN{H}_2/\Delta }{\to }$