Which compounds have the lone pair on nitrogen atom in a p orbital?

NMR of carboxylic acids usually shows presence of -OH group as   

What happens when

When nitrobenzene is subjected to Friedel Crafts alkylation using methyl chloride and AlCl3, the products are

Mark all that apply: which of the following combinations will not afford for a Friedel craft product

What is the transition state when benzene reacts with an electrophile ?  

benzene has bp of 80oC, toluene has bp of 110 oC and xylene has boiling point of 130 oC. The GC of a mixture of these three compounds should show retention times as

Classify the following compounds as aromatic, anti-aromatic or non-aromatic.

For mono-substituted benzenes, the position which holds the substitution/functional groups is called

Based on what you know about benzene, you should classify benzene as