Write the IUPAC name of the product formed in the Reimer-Tiemann reaction.
The Reimer-Tiemann reaction is a method used for the ortho-formylation of phenols. It involves the introduction of a formyl group (-CHO) to the aromatic ring of phenol using chloroform (CHCl₃) in the presence of a strong base, typically sodium hydroxide (NaOH).
The general reaction can be represented as: \[ \text{C}_6\text{H}_5\text{OH} + \text{CHCl}_3 + \text{NaOH} \rightarrow \text{2-formylphenol} + \text{by-products} \]
The product of the Reimer-Tiemann reaction is 2-formylphenol, also known as ortho-hydroxybenzaldehyde.
The IUPAC name of the product formed in the Reimer-Tiemann reaction is 2-formylphenol.
In this reaction, the formyl group (-CHO) is added to the ortho position (adjacent to the hydroxyl group -OH) on the benzene ring.
Therefore, the IUPAC name of the product formed in the Reimer-Tiemann reaction is 2-formylphenol.
Write IUPAC names of the following compounds and classify them into primary, secondary and tertiary amines.
(i) (CH3 )2CHNH2 (ii) CH3 (CH2 )2NH2 (iii) CH3NHCH(CH3 )2
(iv) (CH3 )3CNH2 (v) C6H5NHCH3 (vi) (CH3CH2 )2NCH3 (vii) m–BrC6H4NH2
Give one chemical test to distinguish between the following pairs of compounds.
(i) Methylamine and dimethylamine
(ii) Secondary and tertiary amines
(iii) Ethylamine and aniline
(iv) Aniline and benzylamine
(v) Aniline and N-methylaniline
Account for the following:
(i) pKb of aniline is more than that of methylamine.
(ii) Ethylamine is soluble in water whereas aniline is not.
(iii) Methylamine in water reacts with ferric chloride to precipitate hydrated ferric oxide.
(iv) Although amino group is o– and p– directing in aromatic electrophilic substitution reactions, aniline on nitration gives a substantial amount of m-nitroaniline.
(v) Aniline does not undergo Friedel-Crafts reaction.
(vi) Diazonium salts of aromatic amines are more stable than those of aliphatic amines. (vii) Gabriel phthalimide synthesis is preferred for synthesising primary amines.
Write the IUPAC names of the following compounds:
Write structures of the compounds whose IUPAC names are as follows:
(i)2-Methylbutan-2-ol
(ii)1-Phenylpropan-2-ol
(iii)3,5-Dimethylhexane -1,3,5-triol
(iv)2,3-Diethylphenol
(v)1- Ethoxypropane
(vi)2-Ethoxy-3-methylpentane
(vii)Cyclohexylmethanol
(viii)3-Cyclohexylpentan-3-ol
(ix)Cyclopent-3-en-1-ol
(x)3-Chloromethylpentan-1-ol.
Draw the structures of all isomeric alcohols of molecular formula C5H12O and give their IUPAC names. (ii)Classify the isomers of alcohols in question 11.3(i)as primary, secondary and tertiary alcohols.
Explain why propanol has a higher boiling point than that of the hydrocarbon, butane.
Alcohols are comparatively more soluble in water than hydrocarbons of comparable molecular masses. Explain this fact.