Question

Ch3-ch2-ch2-ch3 --> ch3-ch=ch-ch3​

Answer 1

ch3-ch2-ch2-ch3 --> ch3-ch=ch-ch3​+h2

Answer 2

The given chemical transformation represents the conversion of a linear alkane into an alkene. Let's go step by step through the process:

Starting compound: CH3-CH2-CH2-CH3 (Butane)

Final compound: CH3-CH=CH-CH3 (1-Butene)

To convert butane (CH3-CH2-CH2-CH3) into 1-butene (CH3-CH=CH-CH3), we need to eliminate two hydrogen atoms from adjacent carbon atoms to form a double bond (π bond) between the two carbon atoms. This process is known as "dehydrogenation."

Step 1: Remove a hydrogen atom from the second carbon (C2) and the third carbon (C3) to form a carbocation intermediate:

CH3-CH2-CH2-CH3 -> CH3-CH(+)-CH=CH2 (Carbocation intermediate)

Step 2: Now, the carbocation intermediate will undergo a shift to stabilize the positive charge. A hydride ion (H-) from the adjacent carbon (C2) will shift to the carbon with the positive charge (C+) to form a more stable carbocation:

CH3-CH(+)-CH=CH2 -> CH3-CH=CH(+)-CH3 (Stable Carbocation)

Step 3: Finally, the stable carbocation will capture a hydrogen atom from the surroundings to complete the dehydrogenation process, forming a double bond:

CH3-CH=CH(+)-CH3 -> CH3-CH=CH-CH3 (1-Butene)

The result is 1-butene (CH3-CH=CH-CH3), an alkene with a double bond between the second and third carbon atoms.