Oxidation of Alkynes

Q. Reaction of HBr with propene in the presence of peroxide gives

1. isopropylbromide
2. 3-bromopropane
3. allylbromide
4. n-propylbromide

Q. The rate determining step during a $S_{N}1$ reaction is.

1. Formation of carbocation
2. Attack of nucleophile
   
3. both above are rate determining step
4. can't predict

Q. Which one of the following carbonyl compounds cannot be prepared by addition of water on an alkyne in the presence of $HgS{O}_4\text{and}{H}_{2}S{O}_4$?

1. 

2. 

3. 

4. 

Q. Cold alkaline $KMn{O}_4$ solution converts acetylene into:

1. Acetaldehyde
2. Oxalic acid
3. Acetic acid
4. Glycol

Q. $KMn{O}_4$ will oxidize acetylene to .

1. Ethyl alcohol
2. Ethylene glycol
3. Oxalic acid

Q. Identify the correct reagents A, B and C to convert propanoic acid to ethylamine.
$C{H}_{3}C{H}_{2}COOH\stackrel{A}{\to }X\stackrel{B}{\to }Y\stackrel{C}{\to }C{H}_{3}C{H}_{2}N{H}_2$

1. A	B	C
   $Ca(OH{)}_2$	Heat	$Pt/H_2$

2. A	B	C
   $SOC{l}_2$	$N{H}_3$	$B{r}_2/KOH$

3. A	B	C
   $HN{O}_2$	$P+I_2$	$LiAl{H}_4$

4. A	B	C
   $HCN$	$N{H}_3$	$B{r}_2/KOH$

Q. $Acetylenereactswith42\%H_{2}S{O}_{4}containing1\%HgS{O}_{4}togive:$

1. $C_2{H}_{5}HS{O}_4$
2. $C{H}_{3}CHO$
3. $HCHO$
4. $C{H}_{2}C{H}_2$

Q. Identify compound Y in the following sequence of reactions.

1. 
2. 
3. 
4. 

Q. The oxidation of Toluene withCrO3 in the presence of acetic anhydride gives a product A , which on treatment with aqueous NaOH gives

Q. Consider the following rection scheme:

How many oxygen atoms are present in compound 'C' ?

Q. $1,2-$Diols are oxidized to ketones and /or aldehyde by periodic acid $HI{O}_4$. Periodic acid reacts with vicinal diol to form a cyclic intermediate. Keto and alcohol groups at vicinal position may be oxidised in some cases. Reaction takes place because iodine is in highly positive oxidation sate (+ 7).

1. ~
2. ~

Q. Which of the following is the schmidt rearrangement reaction?

1. $RCOCl\underset{\Delta }{\overset{Na{N}_3}{\to }}RN{H}_2$
2. $RCONHOOC{R}^{\prime }\stackrel{{}^{-}OH}{\to }RN{H}_2$
3. $RCOOH+N_{3}H\stackrel{H_{2}S{O}_4}{\to }R-N{H}_2$
4. $RCON{H}_2\stackrel{B{r}_2+4NaOH}{\to }RN{H}_2$

Q. The compound usually added to chloroform to retard the effect of oxidation is a) ethyl chloride b) ethyl carbonate c) ethanol d)sodium carbonate

Q. Give reason for the following:
Benzaldehyde reduces Tollen's reagent but not the Fehling's or Benedict;s solution.

Q. Explain the mechanism of claisen-schmidt reaction.

Q. $Ca{C}_2+H_{2}O\to A\stackrel{H_{2}S{O}_4/HgS{O}_4}{\to }B$.

Identify A and B in the given reaction

1. C₂H₂ and CH₃
2. CH₄ and HCOOH
3. C₂H₄ and CH₃COOH
4. C₂H₂ and CH₃COOH

Q.
List-I contains questions related to the reaction sequence given and List-II contains their answers.


Which of the following options has the correct combination considering List-I and List-II?

1. $I\to P;II\to R$
2. $I\to P;II\to Q$
3. $I\to Q;II\to R$
4. $I\to Q;II\to P$

Q. $N_2$ gas will not be evloved upon the reaction of $HN{O}_2$ with which of the following amines?

1. 
   $1^{\circ }$
2. 
   $2^{\circ }$
3. 
   $3^{\circ }$
4. 
   Both B and C

Q.
List-I contains questions related to the reaction sequence given and List-II contains their answers.


Which of the following options has the correct combination considering List-I and List-II?

1. $I\to P;II\to R$
2. $I\to P;II\to Q$
3. $I\to Q;II\to R$
4. $I\to Q;II\to P$

Q. $Ph-C\equiv C-C{H}_3\stackrel{H{g}^{2+}/H^{+}}{\to }A$. A is

1. d
2. a
3. b
4. c

Q. Complete the following reaction and identify the products formed.

Q.

1. Ph-HC=CH-Ph

2. 

3. 

4. 

Q. The pH of a buffer solution prepared by mixing $50ml$ of $0.2M$ $C{H}_{3}COOH$ and $25ml$ of $C{H}_{3}COONa$ is $4.8$. What is the concentration of $C{H}_{3}COONa$? $[pKa$ of $C{H}_{3}COOH=4.8]$

1. 0.4M
2. 0.2M
3. 0.5M
4. 0.8M

Q. Which one of the following carbonyl compounds cannot be prepared by addition of water on an alkyne in the presence of $HgS{O}_4\text{and}{H}_{2}S{O}_4$?

1. 

2. 

3. 

4. 

Q. The compound X on reaction with $HgS{O}_4+H_{2}S{O}_4$ gives Y which on oxidation gives acetic acid. X is

1. C₂H₂
2. C₂H₄
3. C₃H₄
4. C₄H₆

Q. Considering the below chemical reaction, identity the product “X”:

1. 
2. 
3. 
4. 

Q. $Acetylenereactswith42\%H_{2}S{O}_{4}containing1\%HgS{O}_{4}togive:$

1. C₂H₅HSO₄
2. CH₃CHO
3. HCHO
4. CH₂CH₂

Q. Which of the following, on oxidation will not give a carboxylic acid with the same number of carbon atoms?

1. $C{H}_{3}COC{H}_3$
2. $CC{l}_{3}C{H}_{2}CHO$
3. $C{H}_{3}C{H}_{2}C{H}_{2}OH$
4. $C{H}_{3}C{H}_{2}CHO$

Q. Consider the following rection scheme:

How many oxygen atoms are present in compound 'C' ?

Q. $Acetylenereactswith42\%H_{2}S{O}_{4}containing1\%HgS{O}_{4}togive:$

1. $C_2{H}_{5}HS{O}_4$
2. $C{H}_{3}CHO$
3. $HCHO$
4. $C{H}_{2}C{H}_2$