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The degree of unsaturation (also known as double bond equivalent or index of hydrogen deficiency) for a compound with the molecular formula $C_{20}H_{22}O_2$ is:

On mixing tetraethyl lead to gasoline available at petrol pumps,

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$(1)$ Two isomers of butane are $n$-butane and isobutane. The relation of the number of $\sigma$ and $\pi$-bonds in them is .......... .
$(2)$ .......... is present in the structure of a heterocyclic compound.
$(3)$ Cyclohexene is a .......... type and furan is a .......... type of compound.
$(4)$ .......... type of $3-D$ model indicates the atomic volume but does not indicate the bond.

Identify which functional group is $NOT$ present in the given compound.

What is obtained when $4$-methylbenzenesulfonic acid reacts with sodium acetate?

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