Question

Second lower homologue of CH3 CH2 CHO

Answer 1

Answer:

The second lower homologue of CH₃CH₂CHO→→CH₃CHO (ethanal or acetaldehyde)

Answer 2

The second lower homologue of propanal (CH3-CH2-CHO) is methanal (HCHO).

• Homologues of organic compounds follow the general formula CnH2n, where the value of n keeps increasing. This is called the homologous series.
• Compounds with one carbon have the prefix 'meth'. For two carbons, 'eth', and so on. 'Prop' is the prefix given to the compound with 3 carbon atoms. Here, the compound has an aldehyde group attached and is hence named propanal.
• The lower analogue would be ethanal, containing 2 carbons. The second lower analogue is methanal or formaldehyde, containing one carbon atom. Hence, by the general formula it is HCHO.