Created by StemPy LabAssertion (A): In the laboratory, but-1-yne and but-2-yne are warmed in separate flasks with water, dilute and at . In each flask the enol formed first changes into a carbonyl compound, and both flasks end with the same carbonyl compound. Reason (R): Both but-1-yne, , and but-2-yne, , carry a hydrogen atom on a triply bonded carbon, so water adds to both by the same route.
← All Quizzes
← Six statements about the acidic character of hydrocarbons are given below. (i) The acidic character falls as HC≡CH > CH₃C≡CH ≫ CH₂=CH₂ > CH₃CH₃. (ii) Ethyne reacts with sodium metal and gives monosodium ethynide and dihydrogen. (iii) All four hydrogen atoms of propyne, CH₃C≡CH, are acidic. (iv) But-2-yne reacts with sodamide and gives ammonia. (v) An sp carbon, with 50% s character, is more electronegative than an sp² or sp³ carbon. (vi) Ethene is more acidic than ethyne, because its π bond is weaker. How many of the statements above are correct?Benzene is nitrated with a mixture of concentrated HNO₃ and concentrated H₂SO₄. The figure shows the steps: the nitronium ion attacks the ring in a slow step, and the intermediate is drawn as three resonance structures. In the fast last step, the hydrogen sulphate ion takes part. Which statement about this intermediate is correct? →
Discussion (0)
Log in to join the discussion.
Loading…