Three organic compounds A,B and C have the following molecular formulae:
A.` C_(4)H_(8)O_(2)`
B. `C_(4)H_(10)O`
C. `C_(4)H_(8)O`
(a) Which compound contains an alcohol group ? Write its name and structural formula.
(b) Which compound contains a carboxyl group? Write its name and structural formula
(c) Which molecular formula can represent an aldehyde as well as a ketone ? Write the names and structural formulae of the aldehyde and ketone represented by this molecular formula.

Explanation

(a) B; Butanol ,`C_(4)H_(9)OH,
H-overset(H)overset|underset(H)underset(|)C-overset(H)overset(|)underset(H)underset(|)C-overset(H)overset(|)underset(H)underset(|)C-overset(H)overset(|)underset(H)underset(|)C-OH`
(b) A; Butanoic acid, `C_(3)H_(7)COOH,
H-overset(H)overset|underset(H)underset(|)C-overset(H)overset(|)underset(H)underset(|)C-overset(H)overset(|)underset(H)underset(|)C-overset(O)overset(||)C-OH`
(c) `C_(4)H_(8)O;"Aldehyde; Butanal",C_(3)H_(7)CHO,
H-overset(H)overset|underset(H)underset(|)C-overset(H)overset(|)underset(H)underset(|)C-overset(H)overset(|)underset(H)underset(|)C-overset(O)overset(||)C-OH;
"Ketone; Butanone",CH_(3)COCH_(2)CH_(3),
H-overset(H)overset|underset(H)underset(|)C-overset(H)overset(|)underset(H)underset(|)C-overset(H)overset(|)underset(H)underset(|)C-overset(O)overset(||)C-OH`,