Consider the following reaction sequence:
Vinylbenzene $\xrightarrow[\Delta]{KMnO_4+KOH} X$ $\xrightarrow[\Delta]{NaOH+CaO} Y$
'$Y$' can also be formed from:

Identify the position where $E.A.S.$ (Electrophilic Aromatic Substitution) will take place.

In which of the following reactions,$t$-butyl benzene is formed?
$1.$ Benzene $+ t$-butyl chloride $\xrightarrow{AlCl_3}$
$2.$ Benzene $+ (CH_3)_2C=CH_2 \xrightarrow{BF_3/HF}$
$3.$ Benzene $+ t$-butyl alcohol $\xrightarrow{H_2SO_4}$
$4.$ Benzene $+$ butanoyl chloride $\xrightarrow{AlCl_3}$ $\xrightarrow{Zn/Hg, HCl}$

Which of the following can not react with Bayer's reagent?

Which of the following groups have an activating effect on the benzene ring?
$-OH, -COCH_3, -NO_2, -NH_2, -Cl, -Br, -NHCOCH_3, -COOH$

Which of the following compounds is not aromatic?