Q 11 :    

When vapours of a secondary alcohol is passed over heated copper at 573 K, the product formed is           [2019]

• a carboxylic acid

   

• an aldehyde

   

• a ketone

   

• an alkene

   

Q 12 :    

In the reaction,

the electrophile involved is                    [2018]

• dichloromethyl cation $\left(\stackrel{+}{\mathrm{C}}{\mathrm{HCl}}_2\right)$

   

• formyl cation $\left(\stackrel{+}{\mathrm{C}}\mathrm{HO}\right)$

   

• dichloromethyl anion $\left(\overline{\mathrm{C}}{\mathrm{HCl}}_2\right)$

   

• dichlorocarbene $(:{\mathrm{CCl}}_2)$

   

Q 13 :    

Compound A, ${\mathrm{C}}_8{\mathrm{H}}_{10}\mathrm{O}$, is found to react with $\mathrm{NaOI}$ (produced by reacting Y with NaOH) and yields a yellow precipitate with characteristic smell. A and Y are respectively       [2018]

Q 14 :    

Identify the major products P, Q and R in the following sequence of reactions:              [2018]

Q 15 :    

Which one is the most acidic compound?             [2017]

Q 16 :    

Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group?         [2015]

• –COOH

   

• –${\mathrm{CHCl}}_2$

   

• –CHO

   

• –${\mathrm{CH}}_2\mathrm{Cl}$

   

Q 17 :    

Which of the following reaction(s) can be used for the preparation of alkyl halides?             [2015]

(I)  ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}+\mathrm{HCl}\stackrel{\mathrm{Anh}. {\mathrm{ZnCl}}_2}{\to }$
(II)  ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}+\mathrm{HCl}\to$
(III)  ${\left({\mathrm{CH}}_3\right)}_3\mathrm{COH}+\mathrm{HCl}\to$
(IV)  ${\left({\mathrm{CH}}_3\right)}_2\mathrm{CHOH}+\mathrm{HCl}\stackrel{\mathrm{Anh}. {\mathrm{ZnCl}}_2}{\to }$

• (I) and (II) only

   

• (IV) only

   

• (III) and (IV) only

   

• (I), (III) and (IV) only

   

Q 18 :    

Which of the following will not be soluble in sodium hydrogen carbonate?        [2014]

• 2,4,6-Trinitrophenol

   

• Benzoic acid

   

• o-Nitrophenol

   

• Benzenesulphonic acid