Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

41.

Which one of the following is an amine hormone?

  • Thyroxine

  • Oxypurin

  • Insulin

  • Progesterone

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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? 


C.

Electron releasing groups stabilise the intermediate cation whereas electron withdrawing groups destabilise it.
The order of electron withdrawing group is:

NO2 > Cl >OH> C6H5
Hence is more reactive towards electrophilic substitution because -OH group least destabilise the carbocation. Further -OH group is strongly activating group while -NO2 and -Cl are deactivating group.

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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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