Hydrogenation of Alkynes

Q. Reaction of acetylene and propyne with $HgS{O}_4$ in presence of $H_{2}S{O}_4$ produces respectively.

1. Acetone and acetaldehyde
2. Acetaldehyde and acetone
3. Propanaldehyde and acetone
4. Acetone and propanaldehyde

Q. Which process converts olefins into parafins

1. Halogenation
2. Dehydration
3. Hydrogenation
4. Hydrolysis

Q. Oils are converted into fats by

1. Hydration
2. Decarboxylation
3. Hydrogentation
4. Dehydrogenation
5. Hydrogenolysis

Q. Identify the product in the given reaction:

1. 
2. 
3. Both (a) and (b)
4. None of these

Q.

An alkyne can be reduced to alkene via:

1. Dissolved metal reduction

2. Hydrogenation using Lindlar’s catalyst

3. Both a and b

4. Lithium aluminium hydride

Q. Choose the correct statement regarding complete combustion of hydrocarbons.

1. During combustion of ethane , hybridisation of carbon changes from $s{p}^2$ to $sp$
2. During combustion of ethyne , hybridisation of carbon changes from $sp$ to $s{p}^2$
3. During combustion of ethyne , hybridisation of carbon remains the same i.e. $sp$
4. (a) and (c) above.

Q. The ene-yne that produces a chiral compound upon treatment with Lindlar's catalyst is:

1. 
2. 
3. 
4. 

Q. If the bond energies of H – H, Br – Br and H – Br are 433, 192 and 364 kJ $mo{l}^{-1}$ respectively, the $\Delta H^{\circ }$ for the reaction ; $H_2\left(g\right)+B{r}_2\left(g\right)\to 2HBr\left(g\right)$ is

1. – 261 kJ
2. + 103 kJ
3. + 261 kJ
4. – 103 kJ

Q. For the given reaction :
$Ca{C}_2+2H_{2}O\stackrel{\Delta }{⟶}A\stackrel{\text{Red hot Fe tube}}{\to }\underset{\text{Major}}{B}$
The major product B is :

1. Toluene
2. Ethylbenzene
3. Butyne
4. Benzene

Q. By which reagent alkyne converts to cis-alkene?
i.e. $C_6{H}_{11}-C\equiv C-C{H}_3\stackrel{R}{⟶}\text{cis-alkene}$:

1. $C{r}_2{O}_3/A{l}_2{O}_3$
2. $H_2,Pd/BaS{O}_4$
3. $Na/dryether$
4. $Na/N{H}_3\left(l\right)$