Question

Write the structural formulae of the following compounds:
(a) Propanal
(b) 2-Methyl pentanoic acid
(c) Propene
(d) 2-Methyl butan-2-ol (often written as 2-methyl-2-butanol)

Hint:

When writing structural formulae, ensure that each bond and functional group (like \(-OH\), \(-COOH\), etc.) is properly represented according to the molecule’s functional class.

Answer 1

(a) Propanal
Condensed structure: \[ \mathrm{CH_3{-}CH_2{-}CHO} \]

(b) 2-Methyl pentanoic acid
Condensed structure: \[ \mathrm{CH_3{-}CH(CH_3){-}CH_2{-}CH_2{-}COOH} \] (Numbering from the –COOH carbon: the methyl is at C-2.)

(c) Propene
Condensed structure: \[ \mathrm{CH_2{=}CH{-}CH_3} \]

(d) 2-Methyl butan-2-ol (often written as 2-methyl-2-butanol)
Condensed structure: \[ \mathrm{(CH_3)_2C(OH){-}CH_2{-}CH_3} \] (–OH and a methyl substituent both at C-2.)