Q 11 :

Consider the following compounds:                              

Hyperconjugation occurs in                                 [2015]

  • III only

     

  • I and III

     

  • I only

     

  • II only

     

(1)

Hyperconjugation can occur only in compound III as it has α-hydrogen atom.



Q 12 :

In which of the following compounds, the C-Cl bond ionisation shall give most stable carbonium ion?           [2015]

  •  

  •  

  •  

  •  

(4)

 is most stable due to hyperconjugation.

 



Q 13 :

The incorrect statement regarding chirality is:      [2022]

  • A racemic mixture shows zero optical rotation.

     

  • SN1 reaction yields 1 : 1 mixture of both enantiomers.

     

  • The product obtained by SN2 reaction of haloalkane having chirality at the reactive site shows inversion of configuration.

     

  • Enantiomers are superimposable mirror images on each other

     

(4)