Single Choice

Which of the following molecules is least resonance stabilized?

A
B
C
Correct Answer
D

Solution

The molecule in the option (C) is least resonance stabilised. This is because, the three $$C=C$$ double bonds are not part of benzene ring (i.e, they do not form alternate single and double bond system in a ring system). All the carbon atoms are not sp2 hybridised. Hence, this molecule is not aromatic. All the remaining molecules are aromatic which leads to delocalisation and obeys Huckels rule.

SIMILAR QUESTIONS

Organic Chemistry

For 1-methoxy-1,3-butadiene, which of the following resonating structure is the least stable?

Organic Chemistry

Resonance structures can be written for:

Organic Chemistry

In which of the following compound, resonance is not possible:

Organic Chemistry

Which of the following conditions is not correct for resonating structures?

Organic Chemistry

A solid has a structure in which, atoms of W, O and Na are located respectively at the corners, centre of the edge and at the centre of the cubic lattice. Name the compound.

Organic Chemistry

Write the resonance structures of (1) $$ CH_3COO^{\ominus }$$ and (2) $$ CH_2=CH-CHO $$. Indicate the relative stability of the contributing structures.

Organic Chemistry

Explain why the following two structures (i) and (ii) cannot be the major contributors to the real structures of $$ CH_3COOCH_3 $$.

Organic Chemistry

Which of the following resonating strictures of l-methoxy 1, 3 -butadiene is least stable?

Organic Chemistry

Draw the resonance structures for $$CH_3CH = CH\overset{+}CH_2$$. Show the electron shift using curved-arrow notation.

Organic Chemistry

What is resonance effect ? What are its various types ? In what respects, does the resonance effect differ from inductive effect ?

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