How many structural isomers of ${\mathrm{C}}_5{\mathrm{H}}_{11}\mathrm{OH}$ will be primary alcohols?

Which among the following compounds will give a secondary alcohol on reacting with excess of Grignard reagent followed by acid hydrolysis?

3

Select the correct answer using the codes given below.

The observed pattern of electrophilic substitution can be explained by

$\left(\mathrm{i}\right)$ The steric effect of the halogen.

$\left(\mathrm{ii}\right)$ The steric effect of the tert-butyl group.

$\left(\mathrm{iii}\right)$ The electronic effect of the phenolic group.

$\left(\mathrm{iv}\right)$ The electronic effect of the tert-butyl group.