NEET 2018 Question Paper with Answer Key PDFs in Kannada XX

NEET Questions

• 1.

  The correct order of decreasing acidity of the following aliphatic acids is:

  • $CH_{3}COOH$ $>$ (CH_{3})_{2}CHCOOH $>$$ (CH_{3})_{3}CCOOH$ $>$ HCOOH
     

  • $CH_3COOH > (CH_3)_2CHCOOH > (CH_3)_3CCOOH$

  • $HCOOH > (CH_3)_3CCOOH > (CH_3)_2CHCOOH > CH_3COOH$

  • $(CH_3)_3CCOOH > (CH_3)_2CHCOOH > CH_3COOH > HCOOH$

  View Solution

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• 2.

  The major product of the following reaction is:
  $Ph-C(=O)-CH_2CH_2-CN$
  (i) $CH_{3}MgBr (excess) (ii) H_{+}H_{2}O$

  • \(Ph-CH(CH_3)-CH_2-COCH_3\)
    
  • $Ph-C(CH_3)(OH)-CH(CH_3)_2$
    
  • $Ph-CO-CH_2CH_2CH_3$
    
  • $Ph-CH(CH_3)-CH_2-CN$
    
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• 3.

  Identify the correct orders against the property mentioned:
  A. H$_2$O $>$ NH$_3$ $>$ CHCl$_3$ - dipole moment
  B. XeF$_4$ $>$ XeO$_3$ $>$ XeF$_2$ - number of lone pairs on central atom 
  C. O–H $>$ C–H $>$ N–O - bond length 
  D. N$_2$>O$_2$>H$_2$ - bond enthalpy 
  Choose the correct answer from the options given below:

  • B, D only
    
  • A, C only
    
  • B, C only
    
  • A, D only
    
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• 4.

  Given below are two statements:
  Statement I: Benzendiazonium salt is prepared by the reaction of aniline with nitrous acid at 273-278 K. It decomposes easily in the dry state.
  Statement II: Insertion of iodine into the benzene ring is difficult and hence iodobenzene is prepared through the reaction of benzendiazonium salt with KI.
  In the light of the above statements, choose the most appropriate answer from the options given below:

  • Both Statement I and Statement II are incorrect.
    
  • Statement I is correct but Statement II is incorrect.
    
  • Statement I is incorrect but Statement II is correct.
    
  • Both Statement I and Statement II are correct.
    
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• 5.

  Given below are two statements:
  Statement I: The primary source of energy in an ecosystem is solar energy. 
  Statement II: The rate of production of organic matter during photosynthesis in an ecosystem is called net primary productivity (NPP).
  In light of the above statements, choose the most appropriate answer from the options given below:

  • Both Statement I and Statement II are incorrect
  • Statement I is correct but Statement II is incorrect
  • Statement I is incorrect but Statement II is correct
  • Both Statement I and Statement II are correct
    
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• 6.

  Which one of the following compounds can exist as cis-trans isomers?

  • 2-Methylhex-2-ene
    
  • 1,1-Dimethylcyclopropane
    
  • 1,2-Dimethylcyclohexane
    
  • Pent-1-ene
    
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