JEE PYQ: Hydrocarbons Question 27
Question 27 - 2020 (09 Jan Shift 1)
The correct order of heat of combustion for following alkadienes is:
(A) (E)-1,3-pentadiene (conjugated) (B) trans-1,3-pentadiene (different geometry) (C) 1,4-pentadiene (non-conjugated)
(1) (A) < (B) < (C)
(2) (A) < (C) < (B)
(3) (C) < (B) < (A)
(4) (B) < (C) < (A)
Show Answer
Answer: (1)
Solution
In isomers of hydrocarbon, heat of combustion is inversely proportional to the stability. Stability order: A > B > C (conjugated > skewed conjugated > isolated). Order of heat of combustion: A < B < C.
BETA
