Oxidation of Alcohols

Q.

The number of isomeric Alcohol(s) with a molecular formula that $C_5{H}_{12}O$ will give a positive iodoform test is:

Q.

How can we convert ethanol to propanenitrile?

Q.

What happens when Ethanol is added to Acetic acid?

Q. Which of the following alcohols will form an aldehyde or a ketone as a product on oxidation with $H^{+}/K_{2}C{r}_2{O}_7$.

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

Q. The ratio of the mass percentages of 'C and H' and C &O of a saturated acyclic organic compound 'X' are 4:1 and 3:4 respectively. Then, the moles of oxygen gas required for complete combustion of two moles of organic compound 'X' is

Q.

Why is the conversion of ethanol to ethanoic acid an oxidation reaction?

Q.

Give equation of the following reactions.
Oxidation of propan-1-ol with alkaline $KMn{O}_4$ solution.

Bromine in $C{S}_2$ with phenol

Dilute $HN{O}_3$ with phenol

Treating phenol with chloroform in presence of aqueous NaOH

Q.

How do you convert propanone to propene?

Q.

Suggest a reagent for the following conversion.

Q.

Suggest a reagent for conversion of ethanol to ethanal.

Q. why zero order reactions are never elementary reactions

Q. The best reagent to convert pent-3-en-2-ol into pent-3-en-2-one is

1. Chromic anhydride in glacial acetic acid
2. Acidic dichromate
3. Acidic permanganate
4. Pyridinium chloro-chromate

Q. Common name of $H_{2}S{O}_4$ is:

1. Oil of vitriol
2. Muriatic acid
3. Blue vitriol
4. Green vitriol

Q.

The most suitable reagent for the conversion of RCH₂OH → RCHO is:

1. KMnO₄

2. K₂ Cr₂ O₇

3. CrO₃

4. PCC

Q.

A compound X with molecular formula C₃H₈O can be oxidised to a compound Y with the molecular formula C₃H6O_2. X is most likely to be [MP PMT 1991]

1. Primary alcohol

2. Secondary alcohol

3. Aldehyde

4. Ketone

Q. The end product $C$ in the following sequence of reaction is:
$C{H}_{3}Br\stackrel{KCN}{\to }\left(A\right)\stackrel{H_3{O}^{+}}{\to }\left(B\right)\underset{LiAl{H}_4}{\overset{Ether}{\to }}\left(C\right)$

1. Acetone
2. Methane
3. Acetaldehyde
4. Ethyl alcohol

Q.

The number of chiral centres and stereoisomers possible for the following compound are respectively

1. 1 and 2

2. 3 and 8

3. 2 and 4

4. 4 and 16

Q.

An aromatic amine (A) was treated with alcoholic potash and another compound (Y) when foul smelling gas

was formed with formula C₆H₅NC. Y was formed by reacting a compound (Z) with Cl₂ in the presence of

slaked lime. The compound (Z) is [CBSE PMT 1990]

1. C₂H₅Cl

2. C₂H₅CHO

3. C₂H₆

4. CHCL₃

Q.

Which of the following reagents can be used to oxidise primary alcohols to aldehydes?
(a) $Cr{O}_3$ in anhydrous medium
(b) $KMn{O}_4$ in acidic medium
(c) Pyridinium chlorochromate
(d) Heat in the presence of Cu at 573K

Q. An alcohol contains 60% carbon and 13.3% hydrogen and shows a positive iodoform test. The alcohol is:

1. 2-propanol
2. 2-butanol
3. 1-propanol
4. 1-butanol

Q.

$C{H}_{3}C{H}_{2}OH$ can be converted into $C{H}_{3}CHO$ by . . . .
(a) catalytic hydrogenation
(b) treatment with $LiAI{H}_4$
(c) treatment with pyridinium chlorochromate
(d) treatment with $KMn{O}_4$

Q.

Suggest a reagent for conversion of ethanol to ethanoic acid.

Q. An organic liquid '$A$' containing $C,H$ and $O$ with boiling point ${78}^{o}C,$ possessing a rather pleasant colour, on heating with concentrated sulphuric acid gives a gaseous product '$B$' with the empirical formula, $C{H}_2$. '$B$' decolourises bromine water as well as alkaline permanganate solution and takes up one mole of $H_2$ (per mole of $B$) in presence of finely divided nickel at high temperature. Identify the substances $A$ and $B.$

1. Ethanol, Ethene
2. Ethanal, Ethyne
3. Glycol, Ethyne
4. Propanol, Propene

Q. correct statements for carbonyl compound in 1.lower member of aldehyde and ketone are water soluble because they form H bond with water 2.carbonyl compund have in between boiling point to that of alcohol and ether of same molecular mass 3.in nucleophilic addition reaction of carbonyl compund when new chiral center is generated the racemic mixture of product is form 4.formalin is aqueous solution of equimolar amnt. of formic and acetic acid

Q. How will you distinguish primary, secondary and tertiary alcohol by Lucas Test?

Q. Which one of the following reactions does not represent correct combination of substrate and product under the given conditions?

Q. Which of the following is required in Stephen reaction?

1. $LiCl$
2. $NiC{l}_2$
3. $SnC{l}_2$
4. $TiC{l}_4$

Q. The product of acidic hydrolysis of P and Q can be distinguished by

1. Lucas Reagent
2. $2,4-$DNP
3. Fehling's Solution
4. $NaHS{O}_3$

Q. In this given reaction

$HOC{H}_2-C{H}_{2}OH\stackrel{\left[X\right]}{\to }HCHO+HCHO$
[X] will be:

$\left(a\right)lmoleofHI{O}_4\left(b\right)2molesofHI{O}_{4}j$
$\left(c\right)conc.HN{O}_3\left(d\right)Mn{O}_2$

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

Q.

Cannizzaro rxn of two molecules of benzaldehyde .(not self cannizzaro)