How many hyperconjugative (no-bond resonance) structures can be drawn for the ion shown, not counting the structure drawn?

Answer: B

The ion shown is the ethyl cation. Its CH3 group has 3 C-H bonds that can overlap with the empty p orbital. Each gives one no-bond structure, so there are 3.

Practice General Organic Chemistry I: Electronic Effects More on Hyperconjugation and steric inhibition of resonance

Previous questionNext question

More questions on Hyperconjugation and steric inhibition of resonance

Count the number of hydrogens on sp3 carbons directly attached to the positively charged carbon of the ion shown. NEET level
Count the number of hydrogens on sp3 carbons directly attached to the positively charged carbon of the ion shown (the number of hyperconjuga... JEE Main level
Count the number of hydrogens on sp3 carbons directly attached to the positively charged carbon of the ion shown. JEE Main level
Count the number of hydrogens on sp3 carbons directly attached to the two sp2 carbons of the alkene shown (the number of hyperconjugative C-... JEE Main level
Compared with 4-nitrophenol (pKa about 7.2), the compound shown is a weaker acid (pKa about 8.3). The reason is JEE Main level
2,6-Dimethyl substitution makes the acid shown stronger than benzoic acid. The best explanation is JEE Main level