A molecule is ${R_3}{\rm{C}}-{\rm{H}}$. If H is replaced by ${\rm{Z}}\left( {{R_3}{\rm{C}}-{\rm{Z}}} \right)$ and on doing so electron density on ${R_3}-{\rm{C}}$ part increases, then Z is :

NEET UG CHEMISTRY MCQ: ORGANIC CHEMISTRY-SOME BASIC PRINCIPLES AND TECHNIQUES

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A molecule is

{R_3}\mathrm{C}-\mathrm{H}

. If H is replaced by

\mathrm{Z}\left( {{R_3}\mathrm{C}-\mathrm{Z}} \right)

and on doing so electron density on

{R_3}-\mathrm{C}

part increases, then Z is :

View answer and explanation

Correct option: C

Electron repelling group

Option C (Electron repelling group) is correct because if the electron density on

R_3C

increases when H is replaced by Z, then Z must be donating electrons, thus repelling them.