Alcohol, phenol & ether MCQs for NEET — Chemistry Questions with Answers

Intermolecular hydrogen bonding is strongest in methanol compared to methylamine, phenol, and methanal. This is because methanol (CH3OH) has a hydroxyl group (-OH) which can form strong hydrogen bonds with other methanol molecules. The oxygen atom in the hydroxyl group is highly electronegative and can attract hydrogen atoms from neighboring molecules, forming strong hydrogen bonds.

$ CH_3 NH_3 ^+ Cl ^ -$ being asalt, undergoes almostcomplete dissociation, therefore, it has ahigh dissociation constant.

For the molecular formula $C_5H_{12}O$, there are 8 possible isomeric alcohols. These include different structural isomers with variations in the position of the hydroxyl group ($-OH$) and branching of the carbon chain. The isomers can be primary, secondary, or tertiary alcohols, each with a unique structure. Therefore, the correct answer is 8.

The conversion of $CH_3CH_2CH_2OH$ (1-propanol) to $CH_3CH_2CH_2COOH$ (butanoic acid) involves the following steps: first, reaction with $PBr_3$ to replace the hydroxyl group with a bromine atom to form $CH_3CH_2CH_2Br$ (1-bromopropane). Next, this compound reacts with $KCN$ to form $CH_3CH_2CH_2CN$ (butyronitrile). Finally, hydrolysis of the nitrile with $H_3O^+$ yields the carboxylic acid $CH_3CH_2CH_2COOH$.