Chemistry Chemical Bonding BUMHS 2024
PMDC Verified Question 16 of 102
A molecule of ethane has _ \( \sigma \) (sigma) bonds.
A
four
B
five
C
six
D
seven
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: seven
Concept:

In a saturated alkane, every single bond between atoms is a direct, head-on sigma (\( \sigma \)) bond.

Formula:

$$ \text{Ethane} = \text{C}_2\text{H}_6 $$

Solution:

  • Ethane consists of two Carbon atoms and six Hydrogen atoms.


  • Each of the 6 Hydrogens forms a single sigma bond with a Carbon atom (6 C-H bonds).


  • The two Carbon atoms form one single sigma bond with each other (1 C-C bond).


  • Total sigma bonds = 6 + 1 = 7.


Why other options are incorrect:

  • Option A, Option B, Option C: These fail to count all the bonds in the molecule, likely missing the central C-C bond or miscounting the hydrogens.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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