An organic compound (A) with molecular formula C 7 H 8 O dissolves in NaOH and gives characteristic colour with FeCl 3. On treatment with Br 2, it gives a tribromo product C 7 H 5 OBr 3. The compound is:

Question

An organic compound (A) with molecular formula C 7 H 8 O dissolves in NaOH and gives characteristic colour with FeCl 3. On treatment with Br 2, it gives a tribromo product C 7 H 5 OBr 3. The compound is: (A) p-Hydroxybenzene (B) 2 -Methoxy-2-phenyl propane (C) m-Cresol (D) p-Cresol

Tardigrade Admin · Accepted Answer

Four DU in A and ( C: H ≈ 1: 1) suggest benzene ring with one extra C atom. Reactivity with NaOH and FeCl 3 suggests ( A ) to be a phenol. The formation of a tribromo product suggests that O - and p-positions are vacant. So methyl group should be present at m-position. Hence, (A) is m-cresol.

Q. An organic compound (A) with molecular formula $C_{7} H_{8} O$ dissolves in $N a O H$ and gives characteristic colour with $F e C l_{3}$ . On treatment with $B r_{2}$ , it gives a tribromo product $C_{7} H_{5} OB r_{3}$ . The compound is:

$p$ -Hydroxybenzene

2 -Methoxy-2-phenyl propane

$m$ -Cresol

$p$ -Cresol

Q. An organic compound (A) with molecular formula C7​H8​O dissolves in NaOH and gives characteristic colour with FeCl3​. On treatment with Br2​, it gives a tribromo product C7​H5​OBr3​. The compound is:

p-Hydroxybenzene

2 -Methoxy-2-phenyl propane

m-Cresol

p-Cresol

Four DU in A and (C:H≈1:1) suggest benzene ring with one extra C atom. Reactivity with NaOH and FeCl3​ suggests (A) to be a phenol. The formation of a tribromo product suggests that O - and p-positions are vacant. So methyl group should be present at m-position. Hence, (A) is m-cresol.

Q. An organic compound (A) with molecular formula $C_{7} H_{8} O$ dissolves in $N a O H$ and gives characteristic colour with $F e C l_{3}$ . On treatment with $B r_{2}$ , it gives a tribromo product $C_{7} H_{5} OB r_{3}$ . The compound is:

$p$ -Hydroxybenzene

$m$ -Cresol

$p$ -Cresol