Which of the following reactions produces an alkene ?

Options

A. `CH_(3)-CH_(3)+N_(2)H_(2)overset (Delta)rarr`
B. `CH_(3)-CH_(2)-CH_(3) overset(Al_(2)O_(3))underset(Cr_(2)O_(3)//Delta)rarr`
C. `CH_(3)-overset(O)overset(||)(C )-CH_(3)+N_(2)H_(4) underset(Delta)overset(NaOH)(to)
D. `CH_(3)-CH_(2)Cl overset(ZN)underset(CH_(3)COOH)rarr`

Answer

b

Explanation

`Cr_(2) O_(3) //Al_(2) O_(3) ` is a good catalst used to bring about dehydrogenation reaction.
`CH_(3)-CH_(2)-CH_(3) overset(Al_(2)O_(3))underset(Cr_(2)O_(3) //Delta)rarrCH_(3)-CH=CH_(2)`