JEE Main · 2020 · 08 Jan 2020 · Shift 2 · Polymers

Preparation of Bakelite proceeds via reactions:

(A)Electrophilic substitution and dehydration✓ Correct
(B)Condensation and elimination
(C)Electrophilic addition and dehydration
(D)Nucleophilic addition and dehydration

Answer: (A)

Solution

Bakelite is a phenol-formaldehyde resin. Formaldehyde first acts as an electrophile, attaching at the activated ortho and para positions of phenol by electrophilic substitution to give hydroxymethyl phenols; these then lose water and link the rings together, so the second stage is a dehydration that cross-links the chains. The preparation thus proceeds by electrophilic substitution followed by dehydration.

JEE Main · 2020 · 08 Jan 2020 · Shift 2 · Single correct option

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