An organic compound having molecular formula `C_3H_7Br` on treatment with aqueous KOH solution gave the compound (A). When the vapour of the compound (A) was passed over red hot copper at `300^@C` compound (B) was formed. The compound (B) on treatment with `l_2` and dil. NaOH, formed a yellow solid (C). Identify the compounds A,B and C.

Explanation

According to given relation,
`C_3H_7Br+KOH(aq)rarrunderset((A))(C_3H_7OH)`
Therefore, when (A) is passed over red hot copper at `300^@C` we get acetone :
`underset((A))(C_3H_7OH)underset"Red hot"overset(Cu,300^@C)rarrCH_3-undersetOunderset"||"C-CH_3`
`CH_3-undersetOunderset"||"C-CH_3overset(I_2+dil.NaOH)rarrunderset((c))(CHI_3)+CH_3COONa`
Hence
(A) is `C_3H_7OH` (alcohol), i.e. `CH_3-underset(OH)underset|CH-CH_3`
(B) is acetone `(CH_3COCH_3)`.
(C) is iodoform `(CHI_3)`.