Question

Coal tar is a mixture of various substances. (T/F)
A) True
B) Flase

Answer 1

In organic chemistry, hydrocarbons are an important topic. We need to know that hydrocarbons are majorly classified as three groups. There are alkane, alkene and alkyne. The alkane means carbon-carbon single bond. The alkene has a carbon-carbon double bond. The alkyne means carbon-carbon having triple bond in the molecule. It has some general formulas. The general formula of alkane is ${C_n}{H_{2n + 2}}$. The general formula of alkene is ${C_n}{H_{2n}}$. The general formula of alkyne is ${C_n}{H_{2n - 2}}$.

Complete answer:
We have to know that the coal tar is a mixture of various substances. Coal tar has some hydrocarbon molecules like alkane, alkene, alkyne and benzene related molecules. It also has some alcohol derived compounds also.
According to the above discussion, the statement that coal tar is a mixture of various substances is true.

Hence, option A is the correct answer.

Additional information:
We need to know that phenol is one of the mono substituent benzene compounds. Each mono-substituted moiety has three named positions in the ring. In the ring a nearby mono substituent group is called ortho position, that means two ortho positions are in the ring, because of the left and right side of the substituent group. The alternatively position of the substituent group in the ring is called meta position, here also two meta positions possible in the left and right side of the substituent group. Para position is nothing but directly opposite to the substituent group in the ring. Electrophilic substitutions are attacked in ortho and para position in the ring.

Note:
We need to know the conversion of one type of hydrocarbon to another hydrocarbon by oxidation and reduction. The oxidation of alkane to give alkene. The oxidation of alkene to give alkyne. The reduction of alkyne to give alkene. The reduction of alkene to give alkane. The oxidation means the addition of oxygen or removal of hydrogen or the loss of electrons in the reactant in chemical reaction. The reduction means the removal of hydrogen or the addition of oxygen or the gain of electrons in the chemical reaction.