Elimination Reaction

Q. Which of the following compounds shall not produce propene by reaction with HBr followed by elimination or direct only elimination reaction ?

1. 
2. 
3. 
4. 

Q.

$C{H}_{3}CHO$ (g) gives $C{H}_4$(g) + CO (g)

Rate =k ${\left[C{H}_{3}CHO\right]}^{\frac{3}{2}}$ determine their order of reaction and the dimensions of the rate constant.

Q.

How do you account for the formation of ethane during chlorination of methane?

Q. Ni^{2+ }can be estimated by used dmg and forms a Rosy red ppt. the complex is extra stabilised by which bonds ?

Q. Consider the following reactions:
A. $\left(C{H}_3{)}_{3}CCH\right(OH)C{H}_3\stackrel{\text{conc.}{H}_{2}S{O}_4}{\to }$
B. $\left(C{H}_3{)}_{2}CHCH\right(Br)C{H}_3\stackrel{\text{alc.}KOH}{\to }$
C. $\left(C{H}_3{)}_{2}CHCH\right(Br)C{H}_3\stackrel{(C{H}_3{)}_3{O}^{-}{K}^{+}}{\to }$

D.

Which of these reaction(s) will not produce Saytzeff product?

1. B and D
2. D only
3. A, C and D
4. C only

Q.

Which of the following is/are elimination reaction(s)?

1. $C{H}_{3}C{H}_{2}Cl+KOH\left(alc\right)\to C{H}_2=C{H}_2+HCl$

2. $C{H}_{3}C{H}_{2}OH+H_{2}S{O}_4\to C{H}_2=C{H}_2+H_{2}O$

3. $C{H}_2=C{H}_2+H^{+}\to C{H}_3-C{H}_2$

4. Both (a) and (c)

Q.

What will happen if sodium chloride is crystallised with a little amount of strontium chloride?

1. It will create cationic vacancy.

2. It will create anionic vacancy.

3. It will crystallize more sodium ions.

4. It will create metal deficiency.

Q. The major product obtained in the following sequence of reaction is:

1. 
2. 
3. 
4. 

Q.

Reaction of Benzyl Bromide with aqueous Sodium Hydroxide follows........... mechanism

Q. $C{H}_{3}C{H}_{2}OH\stackrel{SOC{l}_2}{\to }C{H}_{3}C{H}_{2}Cl\stackrel{KCN}{\to }C{H}_{3}C{H}_{2}CN$ Sn, HCl (A) Reduction Identify (A)

1. $C{H}_{3}C{H}_{2}N{H}_2$
2. $C{H}_{3}C{H}_{2}C{H}_{2}C{H}_{2}N{H}_2$
3. $C{H}_{3}C{H}_{2}C{H}_{2}N{H}_2$
4. $C{H}_{3}N{H}_2$

Q. $C_2{H}_2\underset{Dil{H}_{2}S{O}_4}{\overset{HgS{O}_4}{\to }}P\stackrel{\left(O\right)}{\to }Q\underset{Pyridine}{\overset{SOC{l}_2}{\to }}R\stackrel{(C_2{H}_5{)}_{2}Cd}{\to }S$
The end product in the above sequence of reactions is –

1. Ethylethanal
2. 2-butanone
3. Propanone
4. Propanal

Q.

Which of the following is major product of following reaction?

CH₃CH₂CH = CH₂ + HI

1. 1-iodo butane

2. Iso Butane

3. Butane

4. 2-iodo butane

Q.

Williamsons synthesis is an example of :

1. Nucleophilic substitution reaction

2. Electrophilic substitution

3. Nucleophilic addition

4. Electrophilic addition

Q. Arrange F2, Cl2, Br2 and I2 in descending order of reactivity towards ethane

Q. Consider the following reactions:
A. $\left(C{H}_3{)}_{3}CCH\right(OH)C{H}_3\stackrel{\text{conc.}{H}_{2}S{O}_4}{\to }$
B. $\left(C{H}_3{)}_{2}CHCH\right(Br)C{H}_3\stackrel{\text{alc.}KOH}{\to }$
C. $\left(C{H}_3{)}_{2}CHCH\right(Br)C{H}_3\stackrel{(C{H}_3{)}_3{O}^{-}{K}^{+}}{\to }$

D.

Which of these reaction(s) will not produce Saytzeff product?

1. B and D
2. D only
3. A, C and D
4. C only

Q. Which of the following(s) is/are the conditions for the E1cB reaction to occur?

1. Substrate should have EWG at $\alpha -$ position with respect to leaving group
2. Substrate should have hydrogen atom at $\beta -$ position with respect to leaving group
3. Substrate should have good leaving group
4. Substrate should have poor leaving group

Q. Choose the correct statement from the following option.

1. $S_{N}2$ reaction follows second order kinetics
2. No intermediate is involved in $S_{N}2$ mechanism
3. $S_{N}2$ reactions are one-step reaction
4. All the above

Q. Ethanoic acid reacts with ethanol in presence of conc. $H_{2}S{O}_4$, so as to form a compound and water. The chemical reaction which takes place is called :

1. dehydration
2. hydrogenation
3. esterification
4. disproportionation

Q. Which of the following is a gem dihalide?

1. $C{H}_{3}CH\left(Br\right)C{H}_{2}Br$
2. $C{H}_{3}CHB{r}_2$
3. $C{H}_{3}CH\left(Br\right)C{H}_{2}C{H}_{2}Br$
4. $BrC{H}_{2}C{H}_{2}Br$

Q. Consider the following reactions:
${}^{\prime }{A}^{\prime }$ is :

1. $CH\equiv CH$
2. $C{H}_2=C{H}_2$
3. $C{H}_3-C\equiv C-C{H}_3$
4. $C{H}_3-C\equiv CH$

Q. When Benzaldehyde is condensed with acetic anhydride is presence of fused sodium acetate we get

1. Crotonic acid
2. Cinnamic acid
3. Aspartic acid
4. Salicylic acid

Q. The number of stereoisomers obtained by bromination of trans-2-butene is:

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

Q. In the following sequence of reactions, the end product is:

1. acetone
2. ethyl alcohol
3. secondary propyl alcohol
4. tertiary butyl alcohol

Q. Which of the following is a gemdihalide?

1. $CH3CHB{r}_2$
2. $BrC{H}_{2}C{H}_{2}Br$
3. $C{H}_{3}CHBrCHBrC{H}_3$
4. $CHBr=CHBr$

Q. The major products obtained from the following sequence of reactions are:
$\left(C{H}_3{)}_{2}CHC{H}_{2}N\right(C{H}_{2}C{H}_3{)}_2\stackrel{C{H}_{3}I}{\to }\stackrel{A{g}_{2}O}{\underset{H_{2}O}{\to }}\stackrel{heat}{\to }$products.

1. $(C{H}_3{)}_{2}NC{H}_{2}C{H}_3+H_{2}C=C(C{H}_3{)}_2$
2. $(C{H}_3{)}_{2}CHC{H}_{2}N{H}_2+H_{2}C=C{H}_2$
3. $(C{H}_3{)}_{2}CHC{H}_2\stackrel{C{H}_3}{\stackrel{|}{N}}C{H}_{2}C{H}_3+H_{2}C=C{H}_2$
4. $(C{H}_3{)}_3\stackrel{+}{N}C{H}_{2}C{H}_3{I}^{-}+H_{2}C=C{H}_2$

Q. The products (A) and (B) are:

1. $C{H}_{3}N{H}_2$, $C{H}_{3}N{H}_2$
2. $C{H}_{3}N{H}_2$, No reaction
3. No reaction, $C{H}_{3}N{H}_2$
4. No reaction, No reaction

Q. Column-I contains reaction and Column-II contains properties or major product of reaction given in Column-1. Match Column-I with Column-2.


S (1) Hg?dil. H, SO, ————— (2) NaBH, D Y s N — (2) H, 0, /0H (1) BH/THE (2) H, 0, /0H 1° alcohol is major product 2° alcohol is major product 3" alcohol is major product Syn addition only Rearrangement of carbocation or cyclic transition state is formed 

Q.

How do you account for the formation of ethane during chlorination of methane?

Q. Following is an example of an E2 reaction.

1. True
2. False

Q. The half-life of a reaction becomes half when initial concentrations of reactants are made double. The order of the reaction will be:

1. $2$
2. $1$
3. $0$
4. $3$