The answer is (4) amino acid. This molecule has one carboxyl and one amidogen linked at the same carbon atom. This is the property of amino acid. So this is an amino acid.
<span>((P1V1/T1)=(P2V2/T2))</span>
Answer is: <span>C-an ether.
</span>Ethers are an organic compounds that contain an oxygen atom<span> connected to two </span>alkyl<span> or </span>aryl groups, the general structure of an ether is R-O-R' (<span>R and R' are any </span>alkyl<span> or </span>aryl substituent).
In this example <span>black railroad cars are carbon atoms and one red railroad car is oxygen atom.</span>