Answer:
D
C
Explanation:
C. Butanal , is the aldehyde
A . It is carboxylic acid : ---COOH group
B. It is Ester : ----COOR group , Here R = CH3
C. It is Aldehyde : -----CHO group
D. It is ketone : ----C=O group
See image :
30
48 volts
Voltage (E) = Current (I) x Resistance (R), or E = IR.