Q. A cyclic hydrocarbon molecule has all the carbon and hydrogen in a single plane. All the carbon-carbon bonds are of same length, less than 1.54$\mathring{\mathrm{A}}$, but more than 1.34$\mathring{\mathrm{A}}$. The C-c bond angle will be
A) $109{^\circ}28'$
B) $100{^\circ}$
C) $180{^\circ}$
D) $120{^\circ}$
Explanation
(d)
Cyclic hydrocarbon, with carbon-carbon bond length between$1.34\mathring{\mathrm{A}}\ and\ 1.54\mathring{\mathrm{A}}$, is benzene in which due to resonance, $C - C,$ bond length is $1.39\mathring{\mathrm{A}}$ ($ie.,$between $1.34\mathring{\mathrm{A}} - 1.54\mathring{\mathrm{A}}$). Benzene is a hexagonal molecule with bond-angle equal to$120{^\circ}$.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.