Find out the statements which are not true. A. Resonating structures with more number of covalent bonds and lesser charge separation are more stable. B. In electromeric effect, an unsaturated system shows +E effect with nucleophile and −E 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.

Find out the statements which are not true.

Q. Find out the statements which are not true.

A. Resonating structures with more number of covalent bonds and lesser charge separation are more stable.

B. In electromeric effect, an unsaturated system shows +E effect with nucleophile and −E 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.

(A) A, D & E only

(B) B & D only

(D) B, D & E only

Correct Answer: B & D only

Explanation

Statement A: True. Resonance structures having more covalent bonds and minimum charge separation are more stable.

Statement B: False. In electromeric effect, an unsaturated system shows +E effect with electrophile and −E effect with nucleophile, not vice versa.

Statement C: True. Inductive effect contributes to polarity, dipole moment and hence affects melting and boiling points of polar compounds.

Statement D: False. As the number of alkyl groups attached to a double bond increases, the alkene becomes more stable and the heat of hydrogenation decreases.

Statement E: True. Stability of carbanion increases with increase in s–character (sp > sp² > sp³).

Hence, the statements which are not true are B and D only.

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