Catalytic Hydrogenation

Q.

Which catalyst is used in hydrogenation of oil?

Q. Which is the correct order for rate of hydrogenation?

1. Hept-1-ene < Hept-3-ene < 2-Methylhex-2-ene
2. 3-Methylcyclooctene < 1 - Methylcyclooctene < 1, 2-Dimethylcyclooctene
3. 3-Ethyloct-1-ene < 2-Ethyloct-1-ene < Oct-2-ene
4. Ethene < ethyne

Q.

When n - hexane is heated with $M{o}_2{O}_3$ at ${500}^{0}C$ and 20 atmospheres, the following changes takes place

A. Hybridisation of carbon changes B.No of C - C bonds increases

C. No of C - H bonds decreases D. Percentage of carbon increases

1. A & B only

2. C & D only

3. A, B & C only

4. A, B, C & D

Q. The catalytic hydrogenation is more easier in case of which alkene?

1. $(a{)}_{\underset{H}{╱}}^{\stackrel{R}{╲}}C=C{H}_2$
2. $(b{)}_{\underset{H}{╱}}^{\stackrel{R}{╲}}C=C_{\stackrel{╲}{H}}^{\underset{╱}{R}}$
   
3. $(c{)}_{\underset{R}{╱}}^{\stackrel{R}{╲}}C=C_{\stackrel{╲}{H}}^{\underset{╱}{R}}$
4. $(d{)}_{\underset{R}{╱}}^{\stackrel{R}{╲}}C=C_{\stackrel{╲}{R}}^{\underset{╱}{R}}$

Q.

The enolic form of acetone contains:

1. 9 $\sigma -$ bonds, 1 $\pi -$ bond, and 2 lone pairs.

2. 8 $\sigma -$ bonds, 2 $\pi -$ bond, and 2 lone pairs.

3. 10 $\sigma -$ bonds, 2 $\pi -$ bond, and 1 Ione pair.

4. 9 $\sigma -$ bonds, 2 $\pi -$ bond, and 2 Ione pairs.

Q. Raney-Nickel is an alloy of nickel and aluminium.

1. True
2. False

Q. Which of the following is not true regarding catalytic hydrogenation of alkenes and alkynes?

1. Catalytic hydrogenation occurs by reduction.
2. Ni/Pt/Pd is used as catalyst.
3. Catalytic $H_2$ addition is a anti addition reaction.
4. $C{H}_4$ can’t be prepared by catalytic hydrogenation

Q. Arrange the following in the increasing order of their heat of hydrogenation:

1. $P<Q<R<S$
2. $S<R<Q<P$
3. $S<R<P<Q$
4. $P<Q<S<R$

Q. Consider the following roadmap of reactions given below:

The number of structural isomers of ${}^{\prime }{S}^{\prime }$ formed = $X$
The number of geometrical isomers of ${}^{\prime }{R}^{\prime }$ formed = $Y$
The value of $X+Y$ is

Q. The product obtained on reaction of chloroethane with hydrogen over palladium is __________.

1. $C_3{H}_S$
   
2. $C_4{H}_{10}$
   
3. $C_2{H}_6$
   
4. $C_2{H}_4$

Q. on cracking petrol we get

1. $C{H}_4$
2. $C_3{H}_6$
3. Both (a) and (b)
4. $C{H}_3+C{H}_4+C_2{H}_6+Alcohols$

Q. Which of the following hydrocarbons cannot be obtained by Sabatier and Senderen's reaction

1. $C{H}_4$
   
2. $C_2{H}_6$
   
3. $C_3{H}_8$
   
4. $All$

Q. The catalytic hydrogenation is more easier in case of which alkene?

1. $(a{)}_{\underset{H}{╱}}^{\stackrel{R}{╲}}C=C{H}_2$
2. $(b{)}_{\underset{H}{╱}}^{\stackrel{R}{╲}}C=C_{\stackrel{╲}{H}}^{\underset{╱}{R}}$
   
3. $(c{)}_{\underset{R}{╱}}^{\stackrel{R}{╲}}C=C_{\stackrel{╲}{H}}^{\underset{╱}{R}}$
4. $(d{)}_{\underset{R}{╱}}^{\stackrel{R}{╲}}C=C_{\stackrel{╲}{R}}^{\underset{╱}{R}}$

Q.

For catalytic hydrogenation of alkenes, Ni is a suitable catalyst at room temperature - True or False?

1. True
2. False

Q. Which is the correct order for rate of hydrogenation?

1. Hept-1-ene < Hept-3-ene < 2-Methylhex-2-ene
2. 3-Methylcyclooctene < 1 - Methylcyclooctene < 1, 2-Dimethylcyclooctene
3. 3-Ethyloct-1-ene < 2-Ethyloct-1-ene < Oct-2-ene
4. Ethene < ethyne

Q. The compounds that will give an isomer of 2, 2-dimethyl propane on catalytic hydrogenation are

1. 1 and 4
2. 2 and 4
3. 1 and 3
4. 1 and 2

Q. One mole of each of the following alkenes is catalytically hydrogenated. The quantity of heat evolved will be the lowest in the case of

1. 1-butene
2. Trans-2-butene
3. Cis-2-butene
4. 1, 3-butadiene

Q. Which of the following is correct regarding the structure intermediate formed during the following reaction?
$C_6{H}_6+Conc.HN{O}_3+Conc.H_{2}S{O}_4\stackrel{323-333K}{\to }{C}_6{H}_{5}N{O}_2+H_{2}O$

1. All carbons are $s{p}^3$ hybridised
2. Intermediate is non aromatic in nature
3. None of the above
4. All the carbons are $s{p}^2$ hybridised.

Q. Consider the change in oxidation state of bromine corresponding to different emf values as shown in the diagram below :

$Br{O}_4^{-}\stackrel{1.82V}{\to }Br{O}_3^{-}\stackrel{1.5V}{\to }HBrO\stackrel{1.595V}{\to }B{r}_2\stackrel{1.0652V}{\to }B{r}^{-}$

Then the species undergoing disproportionation is

(NEET 2018)

Q. The reaction
$C{H}_2=C{H}_2+H_2\underset{250-{300}^{\circ }C}{\overset{Ni}{\to }}C{H}_3-C{H}_3$ is called

1. Wurtz's reaction
2. Kolbe's reaction
3. Sabatier and Senderen's reaction
4. Carbylamine reaction