1. Tardigrade
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  3. Chemistry
  4. Cyclic hydrocarbon ' A ' has all the carbon and hydrogen atoms in a single plane. All the carbon-carbon bonds have the same length, less than 1.54 mathringA , but more than 1.34 mathringA . The C - C - C bond angle will be

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Q. Cyclic hydrocarbon ' $A$ ' has all the carbon and hydrogen atoms in a single plane. All the carbon-carbon bonds have the same length, less than $1.54 \,\mathring{A} $, but more than $1.34 \,\mathring{A} $. The $C - C - C$ bond angle will be

AIPMTAIPMT 1989Organic Chemistry – Some Basic Principles and Techniques

Solution:

In aromatic system all the carbon and hydrogen atoms are present in one plane and all $C - C$ bond lengths are same due to resonance and all carbon atoms have $s p^{2}$ hybridisation, so the bond angle is $120^{\circ}$.