1.

Correct order of heat of combustion for following compounds is: (P) `CH_(3)-CH=CH-CH_(2)-CH_(2)-CH_(2)-CH_(3)` (Q) `CH_(2)=CH-CH_(2)-CH_(2)-CH_(2)-CH_(3)` (R) `CH_(3)-CH_(2)-CH=CH-CH_(2)-CH_(2)-CH_(3)`A. QgtRgtPB. RgtPgtQC. PgtRgtQD. QgtPgtR

Answer» Correct Answer - B
heat of combution `prop` No of `pi` bond
`prop(1)/("stability of alkane")and prop` number of carbon
(P). `underset("7 carbon atom"" "5alphaH)(CH_(3)-CH=CH-CH_(2)-)CH_(2)-CH_(2)-CH_(3)`
(Q). `underset(6" carbon atom")(CH_(3)=CH-CH_(2)-)CH_(2)-CH_(2)-CH_(3)`
(R). `undersetunderset(R gt P gt Q)(7" carbon atom"" "4alphaH)(CH_(3)-CH_(2)-CH=CH-CH_(2))-CH_(2)-CH_(3)`


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