Chemistry Hydrocarbon

In this carbocation +M effect of -OCH₃ group stabilizes the carbocation.

While in option (A) and (B), +M of -OCH₃ will not work but in option (C), +M of -OCH₃ works so due to more delocalization in option (D), it is more stable.

Order of electronegativity sp carbon > sp² Carbon > sp³ carbon

1st order reaction is the fastest at the starting of the reaction then it decrease also you can see the slope which is equal to rate.

Kindly consider the following Image 

Two same group on any C-atom of double bond ⇒ (compound does not show geometrical isomerism)

Molybdenum oxide is used to convert alkane to aldehyde i.e. propane to propanal

$C{H}_4+2O_2\to C{O}_2+2H_{2}O$

2 moles of water produced by 1 mole of methane

Or 36 gm of water produced by 1 mole of CH₄

$\therefore$  81 gm of water produced = $\frac{1*81}{36}$  = 2.25 mole of CH₄

Mole of CH₄ required = 225 * 10^-2

the nearest integer = 225

Stability order :
Conjugate > Isolated > Cumulative and (y) is Anti aromatic.
HOC ∝ 1 / (Stability of Alkene)