Synthesis of Aldehydes or Ketones from Alcohols

Q. Identify Z in the sequence of reaction, $C{H}_{3}C{H}_{2}CH=C{H}_2\stackrel{HBr/H_2{O}_2}{\to }Y\stackrel{C_2{H}_{5}ONa}{\to }Z$

1. $(C{H}_3{)}_{2}C{H}_2-O-C{H}_{2}C{H}_3$
2. $C{H}_3(C{H}_2{)}_4-O-C{H}_3$
3. $C{H}_{3}C{H}_2-CH\left(C{H}_3\right)-O-C{H}_{2}C{H}_3$
4. $C{H}_3-(C{H}_2{)}_3-O-C{H}_{2}C{H}_3$

Q. In the following sequence of reactions, the alkene affords the compound 'B' $C{H}_3-CH=CH-C{H}_3\stackrel{O_3}{\to }A\underset{Zn}{\overset{H_{2}O}{\to }}B.$

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

Q.

Compound A on sulphonation with oleum forms benzene sulphonic acid, which on heating with NaOH and acidification yields phenol. What is Compound A?

1. Chlorobenzene

2. Aniline

3. Cumene

4. Benzene

Q.

How is 1-propoxypropane synthesised from propan-1-ol? Write mechanism of this reaction.

Q. How to convert benzaldehyde to benzoic acid

Q. Which of the following compounds has chlorine in +5 oxidation state?

1. 
2. 
3. 
4. 

Q. Reagent used for conversion of allyl alcohol to acrolein is:

1. $KMn{O}_4$
2. $H_2{O}_2$
3. $Mn{O}_2$
4. $Os{O}_4$

Q. Arrange the following in order of their reactvity toward decarboxylation with sodalime. 1.benzoic acid 2.prop-2-enoicacid 3.prop-2-ynoicacid 4.propanaoicacid

Q. Formaldehyde is obtained on a commercial scale by the oxidation of

1. Methanol
2. Ethane
3. Acetylene
4. Ether

Q.

Describe the oxidation of methane and ethane to the corresponding alcohol, aldehyde and acid

Q.

The most suitable reagent for the following conversion is:

1. PCC (pyridinium chlorochromate)

2. $KMn{O}_4$

3. $K_{2}C{r}_2{O}_7$

4. $Cr{O}_3$

Q.
(PCC is Pyridiniumchlorochromate)
Which is correct for the above reaction sequence?

1. Compound B is an aldehyde
2. Boiling point of B is less than A
3. All are correct
4. Compound A is a carboxylic acid

Q. Arrange the following compounds in increasing order of their reactivity in nucleophilic in nucleophili addition reaction:
(i) Ethanal, propanal, propanone, Butanone.
(ii) Benzaldehyde, $p-$Toluahyde, $p-$Nitrobenzeldehyde, Acetophenone.

Q.

Which of the following is true regarding preparation of aldehydes and ketones ?
(i) Both can be prepared by the oxidation of the concerned alcohol with copper at about ${250}^{\circ }C$
(ii) Both can be prepared by the oxidation of the concerned alcohol by oppenauer oxidation.
(iii) Both can be prepared by the oxidation of respective alcohol with acidic dichromate.

1. All the three

2. (i)

3. (ii) and (iii)

4. (i) and (iii)

Q. Find the correct structure of reactant (X) from following : ?

1. 
2. 
3. 
4. 

Q.

Consider the following reactions & identify A, X, Y & Z

1. A-Methoxymethane, X-Ethanol, Y-Ethanoic acid, Z -Semicarbazide

2. A-Ethanal, X-Ethanol, Y-But-2-enal, Z -Semicarbazone

3. A-Ethanol, X-Acetaldehyde, Y-Butanone, Z-Hydrazone

4. A-Methoxymethane, X-Ethanoic acid, Y-Acetate ion, Z-Hydrazine

Q. Grignard reagent is obtained when magnesium is treated with:

1. alkyl halide in the presence of phenol
2. alkyl halide in the presence of alcohol
3. alkyl halide in the presence of alcoholated ether
4. alkyl halide in the presence of dry ether

Q. The conversion of a keto form into enol is enolisation. It depends on structural factor, temperature and nature of solvent. Resonance and hydrogen bonding increases enol content. Enolic form of phenol is more stable than keto form by -13 kcal/mole of energy hence phenol exist exclusively as an enol. Enolic tautomer is less polar due to intramolecular hydrogen bonds than the corresponding keto form. Any polar solvent would decrease the enolisation and favour keto form intramolecular hydrogen bonding stablized enol form by 7kcal/mole and resonance stabilizes enol form by 15 kcal/mole.
The enol content of ethyl acetoacetate is maximum in :

1. acetic acid
2. water
3. ethanol
4. hexane

Q. (vi) Acetylation(vi) Gabriel phthalimide synthesis.Accomplish the following conversions, NOGoo M-ti Nitrobenzene to benzoic acidlifi) Benzene to m-bromophenoliii) Benzoic acid to anilinNaNb+ 2.

Q. In victor-meyer test, primary alcohol gives which of the following colour?

1. Blue
2. White
3. Red
4. Black

Q. Which of the reagents shown below would accomplish the following transformations?

(A)	(B)
1) $H_3{O}^{+}$	$B{H}_{3}THF;H_2{O}_2/NaOH$
2) NaOH	$B{H}_{3}THF;H_2{O}_2/NaOH$
3) HBr in ether	$Hg(OAc{)}_2/H_{2}O;NaB{H}_4$
4) $NaN{H}_2$	$Hg(OAc{)}_2/H_2{O}_2;NaB{H}_4$

Q. This is known as oxidation.

1. swern
2. Dess–Martin
3. jones

Q. Acetophenone and Benzophenone can be distinguished by which of the following test?

1. Aldol condensation
2. HVZ Reaction
3. Knoeveangel reaction
4. Canizzaro's reaction

Q. How do you convert:

(i) Phenol to toulene
(ii) Formaldehyde to Ethanol

Q. Which one of the following reactions will not form acetaldehyde?

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1. 
2. 
3. 
4. 

Q.
Predict the structure of A and B.

1. 
2. 
3. 
4. 

Q. Reagent used for conversion of allyl alcohol to acrolein is:

1. $KMn{O}_4$
2. $H_2{O}_2$
3. $Mn{O}_2$
4. $Os{O}_4$

Q.

Oxidation of primary alcohols give :

1. ketone
2. aldehyde
3. both A and B
4. alcohols

Q. The oxidation states of $Mn$ in $K_{2}Mn{O}_4$ and $KMn{O}_4$ respectively are:

1. $+6,+7$
2. $+7,+7$
3. $+6,+6$
4. $+7,+6$

Q.

Which is the best method used to obtain pure metals of Ti, Zr, Hf?

1. Van Arkel Method

2. Both A & B

3. None of these

4. Cupellation