Through which of the following reactions number of carbon atoms can be increased in the chain?
Benzophenone can be obtained by ............ .
Which of the following is the correct representation for intermediate of nucleophilic addition reaction to the given carbonyl compound (A)?
Why is there a large difference in the boiling points of butanal and butan-1-ol?
Butan-1-ol has intermolecular H-bonding as shown below
Butanol has polar $\mathrm{O} — \mathrm{H}$ bond due to which it shows intermolecular H -bonding which is not possible in case of butanal due to absence of polar bond. Instead of it has only weak dipole-dipole interactions. Hence, butanal has higher boiling point than butan-1-ol.
Write a test to differentiate between pentan-2-one and pentan-3-one.
lodoform test (yellow ppt. formed when heated with sodium hypohalite) Pentan-2-one gives positive test as it contains $-\mathrm{COCH}_3$ group whereas pentan-3-one does not.
