NEET Practice Questions - Chemistry - Alcohols,Phenols and Ethers

Which of the following will not form a yellow precipitate on heating with an alkaline solution of iodine?

(a) CH₃CH(OH)CH₃                                  (b) CH₃CH₂CH(OH)CH₃

(c) CH₃OH                                               (d) CH₃CH₂OH

n-propyl alcohol and iso-propyl alcohol can be chemically distinguished by which reagent 

(a) ${\mathrm{PCl}}_5$

(b) reduction

(c) oxidation with potassium dichromate

(d) ozonolysis

Among the following sets of reactants which one produces anisole?                           

(a) CH₃CHO, RMgX

(b) C₆H₅OH, NaOH, CH₃I

(c) C₆H₅OH, neutral FeCl₃

(d) C₆H₅-CH₃, CH₃COCl, AlCl₃

Consider the following reaction,

Ethanol$\stackrel{{\mathrm{PBr}}_3}{\to }$X $\stackrel{\mathrm{Al}.\mathrm{KOH}}{\to }$ Y $\underset{\left(\mathrm{ii}\right) {\mathrm{H}}_2\mathrm{O}, \mathrm{heat}}{\overset{\left(\mathrm{i}\right) {\mathrm{H}}_2{\mathrm{SO}}_4, \mathrm{room} \mathrm{temperature}}{\to }}$Z                                

The product Z is

(a) CH₂=CH₂

(b) CH₃CH₂OCH₂CH₃

(c) CH₃CH₂OSO₃H

(d) CH₃CH₂OH

In the following sequence of reactions,

${\mathrm{CH}}_3-\mathrm{Br}\stackrel{\mathrm{KCN}}{\to }$A$\stackrel{{\mathrm{H}}_3{\mathrm{O}}^{+}}{\to }$B$\underset{\mathrm{ether}}{\overset{{\mathrm{LiAlH}}_4}{\to }}$C

the end product C is 

(a) acetone                    (b) methane

(c) acetaldehyde            (d) ethyl alcohol

Which one is formed when sodium phenoxide is heated with ethyl iodide?              

(a) Phenetole

(b) Ethyl phenyl alcohol

(c) Phenol

(d) None of the above

When phenol is treated with an excess of bromine water, it gives                                

(a) m-bromophenol                (b) o- and p-bromophenols

(c) 2,4-dibromophenol            (d) 2,4,6-tribromophenol

Identity Z in the sequence of reactions,                                         

CH₃CH₂CH=CH₂ $\stackrel{\mathrm{HBr}/{\mathrm{H}}_2{\mathrm{O}}_2}{\to }$Y$\stackrel{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{ONa}}{\to }$Z

(a) CH₃-(CH₂)₃-O-CH₂CH₃

(b) (CH₃)₂CH₂-O-CH₂CH₃

(c) CH₃(CH₂)₄-O-CH₃

(d) CH₃CH₂-CH(CH₃)-O-CH₂CH₃

Reaction of with RMgX leads to formation  of                             

(a) RCHOHR                         (b) RCHOHCH₃

(c) RCH₂CH₂OH                    (d) $>_{\mathrm{R}}^{\mathrm{R}}{\mathrm{CHCH}}_2\mathrm{OH}$

Reaction of ethyl formate with excess of CH₃MgI followed by hydrolysis gives

(1) n-propyl alcohol                  (2) ethanol              (3) isopropyl alcohol              (4)  propanal