AIPMT 2011 Preliminary Mock Test

Which one of the following is most reactive towards electrophilic reagent?

Which one is a nucleophilic substitution reaction among the following?

Considering the state of hybridization of carbon atoms, find out the molecule among the following which is linear?

In the following reactions, the major products $A$ and $C$ are respectively:$\text{2-methylbutan-2-ol}\stackrel{{\text{H}}^{+}/\Delta }{\to }A\text{ (Major)}\stackrel{\text{HBr/Dark}}{\to }C\text{ (Major)}$

The Lassaigne's extract is boiled with conc. ${\text{HNO}}_3$ while testing for halogens. By doing so it: