0 110 Which of the following compounds has the roost negativeheat of hydrogenati

Question

0 110 Which of the following compounds has the roost negativeheat of hydrogenation? A) 1,4-hexadiene (B) 1,5-hexadiene (C) 1,2-hexadiene (D 1,3-hexadiene (E) hex-1-ene 2 Which compounds is the most stable? (A) 1,4-pentadiene (B) trans-1,3-pentadiene (C) trans-1,4-pentadiene (D) cis-1,4 pentadiene 3. The Diels-Alder reaction is a concerted reaction; this means: (A) A mixture of endo and exo products is formed. (B) All bond making and bond breaking occurs simultaneously. (C) The products contain rings. (D) The reaction follows Markovnikov's rule. (B) The reaction is highly endothermic.

Explanation / Answer

Ans 1 : D) 1,3-Hexadiene

The compound has double bonds which are in conjugation with each other. Due to this the heat of hydrogenation is not additive and it accounts for the most negative heat of hydrogenation in all other compounds.

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