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NEET Practice Questions (MCQs) with Answers & Solutions

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Synthetic human hair wigs are made from a copolymer of vinyl chloride and acrylonitrile and is called:

PVC

polyacrylonitrile

cellulose

dynel

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Explanation

Dynel is a copolymer of vinyl chloride and acrylonitrile.

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Nylon-66 is a polyamide obtained by the reaction of

$COOH ({CH}_{2})_{4} COOH + H_{2} {NC}_{6} H_{4} {NH}_{2} - (p)$

$COOH ({CH}_{2})_{4} COOH + {NH}_{2} ({CH}_{2})_{6} {NH}_{2}$

$COOH ({CH}_{2})_{4} COOH + {NH}_{2} ({CH}_{2})_{4} {NH}_{2}$

${COOHC}_{6} H_{4} COOH - (p) + {NH}_{2} ({CH}_{2})_{6} {NH}_{2}$

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Which one is protein fibre ?

Cotton

Rayon

Silk

Polyster

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Explanation

Silk wool are protein fibre. Cotton rayon is cellulose fibre,

terylene is polyester fibre.

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Bakelite is prepared by the reaction between

urea and formaldehyde

ethylene glycol

phenol and formaldehyde

tetramethylene glycol

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Explanation

Bakelite is a polymer obtained by the condensation reaction between phenol and formaldehyde. It is a condensation polymer and basic unit of Bakelite is Novolac.

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Terylene is a condensation polymer of ethylene glycol and

benzoic acid

phthalic acid

salicylic acid

terephthalic acid

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Melamine plastic crockery is a copolymer of:

HCHO and melamine

HCHO and ethylene

melamine and ethylene

none of the above

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Acrilan is a hard, horny and a high melting material. Which of the following represents its structure ?

${(- {CH}_{2} - \underset{{COOC}_{2} H_{5}}{\underset{|}{CH}} -)}_{n}$

${(- {CH}_{2} - \underset{Cl}{\underset{|}{CH}} -)}_{n}$

${(- {CH}_{2} - \underset{CN}{\underset{|}{CH}} -)}_{n}$

${(- {CH}_{2} - \underset{{COOCH}_{3}}{\underset{|}{\overset{{CH}_{3}}{\overset{|}{C}}}} -)}_{n}$

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Explanation

Acrilan means polyacrylonitrile (PAN).

${(- {CH}_{2} - \underset{CN}{\underset{|}{CH}} -)}_{n}$

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Of the following which one is classified as polyster polymer ?

Bakelite

Melamine

Nylon-66

Terylene

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The polymer containing strong intermolecular forces, e.g., hydrogen bonding is:

natural rubber

teflon

nylon-6,6

polystyrene

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Explanation

Due to the presence of -NH gp.

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Nylon-6, 10 is a polymer of:

hexamethylene and adipic acid

hexamethylene and sebacic acid

caprolactam

none of the above

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Explanation

$\underset{Sebacic Acid}{n HO - \overset{O}{\overset{| |}{C}} - {({CH}_{2})}_{8} - \overset{O}{\overset{| |}{C}} - OH} + \underset{H e x a m e t h y l e n e d i a m m i n e}{n H_{2} N - {(C H_{2})}_{6} - N H_{2}} \overset{c o n d e n s a t i o n p o l y m e r i s a t i o n}{\to} \underset{Nylon - 6, 10}{{[- \overset{O}{\overset{| |}{C}} - {(C H_{2})}_{8} - \overset{O}{\overset{| |}{C}} - N H - {(C H_{2})}_{6} - \overset{H}{\overset{|}{N}}]}_{n}} + n H_{2} O$

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