Find out the statements which are not true.
A. Resonating structure with more number of covalent bonds and lesser charge separation are more stable.
B. In electromeric effect, an unsaturated system shows effect with nucleophile and effect with electrophile.
C. Inductive effect is responsible for high melting point, boiling point and dipole moment of polar compounds.
D. The greater the number of alkyl groups attached to the doubly bonded carbon atoms, higher is the heat of hydrogenation.
E. Stability of carbanion increases with the increase in s-character of the carbon carrying the negative charge.
Choose the correct answer from the options given below.
- A
A, D & E only
- B
B, D & E only
- C
A, C & D only
- D
B & D only
Evaluating each:
A. True — More covalent bonds and less charge separation make a resonance contributor more stable.
B. False — The polarity convention is reversed. With an electrophile, the unsaturated system donates electrons (); with a nucleophile, it accepts ().
C. True — Inductive (and dipolar) effects raise melting/boiling points and dipole moments in polar compounds.
D. False — More alkyl substitution stabilizes the alkene (hyperconjugation), so heat of hydrogenation is lower, not higher.
E. True — Greater s-character holds the lone pair closer to the nucleus, stabilizing the carbanion.
B and D are the false statements.
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