An ester linkage is present in :

• nylon - 6

• nylon - 6 , 6

• dacron

• rayon

Williamson's synthesis involves :

• S_N1 mechanism

• nucleophilic addition

• S_N2 mechanism

• S_E  mechanism

Chloropicrin is used as an insecticide and has been used as tear war gas .The chloropicrin is :

• CH₂ClCCl₃

• CCl₃NO₂

• CH₂(CH₃)CH₂Cl

• CHI₃

 $\underset{∆}{\overset{\mathrm{Soda} \mathrm{lime}}{\to }}$ A $\stackrel{?}{\to }$ Anisole

Reagent in second step should be :

• CH₃Cl

• KOH + C₂H₅OH

• KOH + C₂H₅SH

• KOH + Cl₂

Identify the product Y in the sequence :

CH₃CHO + CH₃MgI $\stackrel{\mathrm{Ether}}{\to }$ X $\stackrel{{\mathrm{H}}_2\mathrm{O}/{\mathrm{H}}^{+}}{\to }$ Y , is

• CH₃OH

• CH₃CH₂OH

• (CH₃)₂CHOH

• (CH₃)₃COH

Two moles of acetic acid are heated with P₂O₅ .The product formed is :

• 2 moles of ethyl alcohol

• formic anhydride

• acetic anhydride

• 2 moles of methyl cyanide

57.

The reaction , ROH + H₂CN₂ in the presence of HBF₄ , gives the following product :

• ROCH₃

• RCH₂OH

• ROHCN₂N₂

• RCH₂CH₃

Lecithin is an example of :

• carbohydrate

• hormones

• vitamins

• phospholipid

Artificial silk is :

• nylon - 6

• rayon

• nylon 66

• none of these

Which of the following is common example of fibres ?

• Bakelite

• Buna - S

• Nylon - 66

• PVC