Alcohols & phenols & ethers practice · Medium

Which one of the following compounds will not react with $\mathrm{C}{\mathrm{H}_3}\mathrm{MgBr}$?

Which of the following statements are correct?

(i) In phenols, the $-{OH}$ group is attached to $s p^2$ hybridised carbon of an aromatic ring

(ii) The carbon - oxygen bond length (136 pm) in phenol is slightly more than that in methanol

(iii) Partial double bond character is due to the conjugation of unshared electron pair of oxygen with the aromatic ring.

(iv) $s p^2$ hybridised state of carbon to which oxygen is attached.

Ether fire can be extinguished by:

Given below are two statements.

Statement-I: Phenol reacts with bromine in ${CCl}_4$ gives a white ppt. of 2,4,6-tribromophenol.

Statement-II : Phenol reacts with dil. ${HNO}_3$ at $0-10^{\circ} \mathrm{C}$ to form o- and p-nitrophenol

Choose the most appropriate answer from given below options:

Assertion: Phenol is a strong acid than ethanol.

Reason: Groups with $+{M}$ effect decreases acidity at p-position.

Assertion: Ethanol can be distinguished from methanol using iodoform test.

Reason: Ethanol has a methyl group attached to a carbon containing hydroxyl groups.

Identify $(Z)$ in the following series,
${\text{Ethanol}}\xrightarrow{{PB{r_3}}}\left( X \right)\xrightarrow[{KOH}]{{{\text{Alc}}{\text{.}}}}\left( Y \right)\xrightarrow[{(ii)\,{H_2}O;\,\,{\text{heat}}}]{{(i)\,{H_2}S{O_4}/{\text{Room}}\,\,{\text{temp}}{\text{.}}}}\left( Z \right)$

When ethyl alcohol $\left({C}_2 {H}_5 {OH}\right)$ reacts with thionyl chloride, in the presence of pyridine, the gas obtained is

Replacement of $\mathrm{Cl}$ of chlorobenzene to give phenol requires drastic conditions but chlorine of 2, 4-dinitrochlorobenzene is readily replaced because:

What is Z in the following sequence of reactions? $Z\xrightarrow{{PC{l_5}}}X\xrightarrow{{Alc.KOH}}Y\xrightarrow[{(ii)\,{H_2}O\,;\,\,boil}]{{(i)\,\,Conc.\,{H_2}S{O_4}}}Z$

Assertion: Boiling point of ethanol is higher than that of propane.

Reason: Molecular mass of ethanol is higher than propane.

Dehydration of alcohols to alkene by heating with conc. ${H_2}S{O_4}$ the initiation step is …….. followed with …. Mechanism.

Primary, secondary and tetiary alcohols are distinguished from one another by

Which of the following reagent is used to distinguish phenol and benzoic acid?

Which statement is true regarding following reactions trans $-2-$ Butene $\stackrel{\mathrm{HCO}_{3} H}{\longrightarrow} A$ cis-2-Butene $\stackrel{\mathrm{HCO}_{3} \mathrm{H}}{\longrightarrow} B$

Which of the following is a gas?

A compound $X$ with molecular formula ${\mathrm{C}_3}{\mathrm{H}_8}\mathrm{O}$ can be oxidised to a compound $Y$ with the molecular formula ${\mathrm{C}_3}{\mathrm{H}_6}{\mathrm{O}_2}$. $X$ is most likely to be:

A compound with molecular formula ${\mathrm{C}_4}{\mathrm{H}_{10}}{\mathrm{O}_3}$ is converted by the action of acetyl chloride to a compound with molecular weight 190. The original compound has:

The compound formed when Ethyl bromide is heated with dry Silver oxide is

${\mathrm{C}_2}{\mathrm{H}_5}\mathrm{OH}$ and ${\mathrm{C}_2}{\mathrm{H}_5}\mathrm{OH}$ can be distinguished by

Which of the following alcohols is dehydrated most readily with conc. ${\mathrm{H}_2}\mathrm{S}{\mathrm{O}_4}?$

Addition of Grignard reagent to acetaldehyde followed by hydrolysis and then acidic dehydration of the resulting product gives

To obtain unsaturated alcohols from unsaturated aldehydes the following reagent is used for reduction:

Arrange the compounds in order of decreasing acidity:

I. ${Cl}-{CH}_2-{CH}_2-{SH}$

II. ${Cl}_2 {CH}-{CH}_2-{SH}$

III. ${Cl}-{CH}_2-{CH}_2-{OH}$

IV. ${CH}_3-{CH}_2-{OH}$

$\underset{\text{(Ester A)}}{\mathrm{C}_4 \mathrm{H}_8 \mathrm{O}_2}+\underset{\text{(2 parts)}}{\mathrm{CH}_3 \mathrm{MgBr}} \xrightarrow{\mathrm{H}_3 \mathrm{O}^{+}} \underset{\text{Alcohol(B)}}{\mathrm{C}_4 \mathrm{H}_{10} \mathrm{O}}$

Alcohol $\text{B}$ reacts faster with Lucas reagent. Hence $\text{A}$ and $\text{B}$ are

Dehydration of 2-butanol yields

For the preparation ter-butylmethylether by Williamson’s method the correct choice of reagents is:

Assertion (A): $7.5 \mathrm{~g}$ of ethoxyethane and $9 \mathrm{~g}$ of butan-1-ol is miscible to almost same extent while pentane is essentially immiscible with water.

Reason (R): Alcohols and ethers can form hydrogen bonds with the water molecule.

Chlorex which is a good solvent for aromatic impurities is:

An alcohol on oxidation is found to give $C{H_3}COOH$ and $C{H_3}C{H_2}COOH$ The alcohol is: