Alcohol Phenols And Ethers - Organic Chemistry - Chemistry Previous Year Questions

In the following sequence of reactions

$$\mathrm{CH}_3 \mathrm{Br} \xrightarrow{\mathrm{KCN}} A \xrightarrow{\mathrm{H}_3 \mathrm{O}^{-}} B \xrightarrow{\mathrm{LiAl} / \mathrm{H}_4}$$

The end product $C$ is

What is the increasing order of acidic strength among the following?

(i) p-methoxy phenol

(ii) $p$-methyl phenol

(iii) $p$-nitro phenol

Match the following acids with their \(pKa\) values :

Which of the following can be used to test the acidic nature of ethanol?

The steps involved in the conversion of propan -2-ol to propan -1-ol are in the order

Which of the following on heating gives an ether as major products?

(P) \(\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}_2 \mathrm{Br}+\mathrm{CH}_3 \mathrm{ONa}\)

(Q) \(\mathrm{C}_6 \mathrm{H}_5 \mathrm{ONa}+\mathrm{CH}_3 \mathrm{Br}\)

(R) \(\left(\mathrm{CH}_3\right)_3 \mathrm{C}-\mathrm{Cl}+\mathrm{CH}_3 \mathrm{ONa}\)

(S) \(\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}=\mathrm{CHCl}+\mathrm{CH}_3 \mathrm{ONa}\)

A compound \('A' \left(\mathrm{C}_7 \mathrm{H}_8 \mathrm{O}\right)\) is insoluble in \(\mathrm{NaHCO}_3\) solution but dissolve in \(\mathrm{NaOH}\) and give a characteristic colour with neutral \(\mathrm{FeCl}_3\) solution. When treated with bromine water compound '\(A\)' forms the compound \(B\) with the formula \(\mathrm{C}_7 \mathrm{H}_5 \mathrm{OBr}_3\). '\(A\)' is

The major product of the following reaction is

$$\mathrm{CH}_2=\mathrm{CH}-\mathrm{CH}_2-\mathrm{OH} \xrightarrow[\text { Excess }]{\mathrm{HBr}} \text { Product }$$

An organic compound with molecular formula \(\mathrm{C}_7 \mathrm{H}_8 \mathrm{O}\) dissolves in \(\mathrm{NaOH}\) and gives a characteristic colour with \(\mathrm{FeCl}_3\). On treatment with bromine, it gives a tribromo derivative \(\mathrm{C}_7 \mathrm{H}_5 \mathrm{OBr}_3\). The compound is

The major product obtained when ethanol is heated with excess of conc. \(\mathrm{H}_2 \mathrm{SO}_4\) at \(443 \mathrm{~K}\) is

In Kolbe's reaction the reacting substances are

Among the following, the products formed by the reaction of anisole with \(\mathrm{HI}\) are

Which is most VISCOUS?

$$\begin{aligned} & \mathrm{CH}_3-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_2 \mathrm{OH} \stackrel{\mathrm{PCC}}{\longrightarrow} \\\\ & \mathrm{CH}_3-\mathrm{CH}=\mathrm{CH}-\mathrm{CHO} \end{aligned}$$

Hybridisation change involved at \(\mathrm{C}\)-\(1\) in the above reaction.

A better reagent to oxidise primary alcohols into aldehyde is