NEET 2018 Question Paper with Answer Key PDFs in English BB

NEET Questions

• 1.

  Identify the suitable reagent for the following conversion: $Ph-C(=O)-OCH_3$ $\longrightarrow$ $Ph-CHO$

  • (i) $AlH(iBu)_{2}$ (ii) $H_{2}O$
     

  • (i) $NaBH_{4}$, (ii) $H^{+}H_{2}O$
     

  • $H_{2}$ $Pd-BaSO_{4}$
     

  • (i) $LiAlH_{4}$, (ii) $H^{+}$$H_{2}O$
     

  View Solution

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• 2.

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

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

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• 3.

  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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• 4.

  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
    
  View Solution

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• 5.

  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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• 6.

  Name the class of enzyme that usually catalyzes the following reaction: \[ S - G + S^{\prime} \rightarrow S + S^{\prime} - G \] Where \( G \) represents a group other than hydrogen, \( S \) is a substrate, and \( S^{\prime} \) is another substrate.

  • Lyase
  • Transferase
  • Ligase
  • Hydrolase
    
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