`2`-Methylbut-`2`-ene will be represented as

Options

A. (1) `CH_(3)-underset(OH)underset(|)(CH)-CH=underset(CH_(3))underset(|)(C )-CHO`
B. (2) `CH_(3)CH_(2)underset(CH_(3))underset(|)C =CH_(2)`
C. (3) `CH_(3)-underset(CH_(3))underset(|)(C ) =CH-CH_(3)`
D. (4) `CH_(3)-underset(CH_(3))underset(|)(CH_(2))-CH_(2) CH_(3)`

Answer

C

Explanation

First make a skeleton of four `C's`:
`C-C-C-C`
Introduce a double bond at `C-2`
`C-C=C-C`
Attach methyl group at `C-2` and also satisfy the valencies of the `C's` with suitable number of `H` atoms:
`CH_(3) - underset(CH_(3))underset(|)(C )=CH-CH_(3)`