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STD 11 - 8.1. Organic chemistry Nomenclature of organic compounds — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 8.1. Organic chemistry Nomenclature of organic compounds4 Marks
MCQ
Which $C-$atoms is the most electronegative in this structure $\mathop {C{H_3}}\limits^{{\rm{III}}} - \mathop {C{H_2}}\limits^{{\rm{II}}} - C \equiv \mathop {CH}\limits^{\rm{I}} $
  • ✓
    $I$
  • B
    $II$
  • C
    $III$
  • D
    All are equal electronegative
✓

Answer

Correct option: A.
$I$
a
$\mathop {C{H_3}}\limits^{{\rm{III}}} - \mathop {C{H_2}}\limits^{{\rm{II}}} - C \equiv \mathop {CH}\limits^{\rm{I}} $

Elecronegativity $\propto$ $s$-character.

In $sp$ hybrid orbitals, $s$ character $=50\, \%$

and in $sp ^3$ hybrid orbitals, $s$ character $=33.3 \,\%$

Thus, option $I$ is the most electronegative.

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