Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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41.

Which one of the following is an amine hormone?

  • Thyroxine

  • Oxypurin

  • Insulin

  • Progesterone


A.

Thyroxine

The hormone which is proteinous nature are said to be amine hormone because protein is the polymers of polypeptides and polypeptides are made up of amino acids. An amino acid contains amino group.

Thyroxin is an amine hormone. It is secreted by the thyroid gland. Its function is to control the metabolism of carbohydrates, proteins and lipids.

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42.

Which one of the following statements is not true? 

  • In vulcanization, the formation of sulphur bridges between different chains make rubber harder and stronger

  • Natural rubber has the trans-configuration at every double bond

  • Buna-S is a copolymer of butadiene and styrene

  • Natural rubber is a 1,4 polymer of isoprene

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43.

In DNA. the complimentary bases are 

  • Adenine and thymine; guanine and cytosine

  • Adenine and thymine; guanine and uracil

  • Adenine and guanine, thymine: Guanine and uracil

  • Uracil and adenine; cytosine and guanine

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44.

Acetophenone when reacted with a base, C2H5ONa, yields a stable compound which has the structure

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45.

The relative reactivities of acyl compounds towards of nucleophilic substitution are in the order of 

  • Acyl chloride> Acid anhydride> Ester> Amide

  • Ester > Acyl chloride> Amide > Acid anhydride

  • Acid anhydride > Amide > Ester> Acyl chloride

  • Acyl chloride > Ester > Acid anhydride > Amide

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46.

Which one of the following is most reactive towards electrophilic attack? 

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47.

In an SN2  substitution reaction of the type which  one of the followings has the highest relative rate?

  • CH3-CH2-CH2Br

  • CH3-CH(CH2)-CH2Br

  • CH3C(CH3)2CH2Br

  • CH3CH2Br

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48.

A ( Predominantly) is
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49.

In a reaction of aniline, a coloured product C was obtained.

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