361. How will you prepare:

Propyne from propanal? 

Explain the reason why:
Carbon-oxygen bond lengths in formic acid are 1.23 Å and 1.36 Å, but both the carbon-oxygen bonds in sodium formate have the same value, 1.27 Å.

Explain the reason why:
Acetic acid can be halogenated in the presence of red P and Cl₂ but formic acid cannot be halogenated in the same way.

Explain the reason why:
Formic acid is stronger than acetic acid.

Explain the reason why:
The carboxylate ion, RCOO^- is more stable than the carboxylic acid, RCOOH.

Explain the reason why:

Carboxylic acids, despite the presence of C = O group in the molecule, do not form oximes, hydrazones, etc.

When a mixture of acetic acid and formic acid vapour is passed over MnO catalyst at 573 K, _________ is formed.

When acetaldehyde is treated with aluminium ethoxide, _________ is formed.