Question

Find the compound ‘X’ which gives the following test.

Neutral ${\mathrm{FeCl}}_3$: -ve

Fehling solution: -ve

Iodoform reaction: +ve

Grignard reagent: +ve

• A.

  

• B.

  

• C.

  

• D.

  

Answer 1

The correct option is A

Explanation for the correct option:

(A) Neutral ${\mathrm{FeCl}}_3$ test: -ve( phenol group is not present)

Fehling test: -ve ( $\mathrm{CHO}$ group is not present)

Iodoform test: +ve (the above compound can be oxidized to a group containing $\mathrm{\alpha }$-methyl group).

Grignard reagent: +ve (compound has acidic-$\mathrm{H}$ group).

Hence, option A is correct.

Explanation for the incorrect option:

(B) Neutral ${\mathrm{FeCl}}_3$ test: +ve( phenol group is present)

Fehling test: -ve ( $\mathrm{CHO}$ group is not present)

Iodoform test: +ve (the above compound can be oxidized to a compound containing $\mathrm{\alpha }$-methyl group).

Grignard reagent: +ve (compound have acidic-$\mathrm{H}$ group)

Hence option B is incorrect

(C) Neutral ${\mathrm{FeCl}}_3$ test: -ve( phenol group is not present)

Fehling test: -ve ( $\mathrm{CHO}$ group is not present)

Iodoform test: -ve (the above compound doesn't contain $\mathrm{\alpha }$-methyl group).

Grignard reagent: +ve (compound has acidic-$\mathrm{H}$ group)

Hence option C is incorrect

(D) Neutral ${\mathrm{FeCl}}_3$ test: +ve( phenol group is present)

Fehling test: -ve ( $\mathrm{CHO}$ group is not present)

Iodoform test: +ve (the above compound doesn't contain $\mathrm{\alpha }$-methyl group.)

Grignard reagent: +ve (compound has acidic-$\mathrm{H}$ group)

Hence option D is incorrect.

Therefore, option A is correct.