Which compound can be used to preserve biological specimens?
Answer
A
A central C is double bonded to an O, and single bonded to 2 H.
B
A chain, reading from left: C H 3 bonded to C, bonded to O, bonded to C H 2, bonded to C H2, bonded to C H 3. The single C near the beginning of the chain is double bonded to O.
C
C H 3 single bonded to C, which is double bonded above right to O, and below right to C H 2, which is bonded to C H 3.
D
A central C is double bonded to an O above, and single bonded to C H 3 below left and O H below right.