Propene on addition with bromine in CCl_4 gives

The correct answer is Option (1) → 1,2-Dibromopropane

Alkenes undergo electrophilic addition of halogens. Bromine in carbon tetrachloride adds one bromine atom to each carbon of the double bond, giving a vicinal dibromide (both bromines on neighbouring carbons). The reddish brown colour of bromine disappears, which is the usual laboratory test for a C=C double bond.

    \( \displaystyle \ce{CH3-CH=CH2 + Br2} \xrightarrow{\ce{CCl4}} \ce{CH3-CHBr-CH2Br} \)

So propene gives 1,2-dibromopropane, a colourless liquid.

NCERT (2026-27 edition):
Addition of Halogens