Oxidation, reduction and distinguishing tests — NEET & JEE Questions

Question 1 · difficulty L1 · recall

Controlled oxidation of a primary alcohol can first produce an

• A. aldehyde
• B. ketone
• C. alkane
• D. ether

Question 2 · difficulty L2 · understanding

A student is given one compound among the following compounds that gives positive test with Tollen's reagent. The compound is :

• A. B
• B. D
• C. A
• D. C

Question 3 · difficulty L2 · understanding

Which of the following compounds will give silver mirror with ammoniacal silver nitrate? A. Formic acid B. Formaldehyde C. Benzaldehyde D. Acetone Choose the correct answer from the options given below :

• A. B and C only
• B. C and D only
• C. A, B and C only
• D. A only

Question 4 · difficulty L2 · understanding

Which among the above compound/s does/do not form Silver mirror when treated with Tollen's reagent?

• A. (I), (III) and (IV) only
• B. Only (IV)
• C. Only (II)
• D. (III) and (IV) only

Question 5 · difficulty L2 · understanding

2, 4-DNP test can be used to identify :

• A. ether
• B. amine
• C. aldehyde
• D. halogens

Question 6 · difficulty L2 · understanding

The spin only magnetic moment of the complex present in Fehling's reagent is __________ B.M. (Nearest integer).

Question 7 · difficulty L2 · understanding

In Tollen's test for aldehyde, the overall number of electron(s) transferred to the Tollen's reagent formula [Ag(NH 3 ) 2 ] + per aldehyde group to form silver mirror is ___________. (Round off to the Nearest Integer).

Question 8 · difficulty L3 · understanding

An optically active alkyl bromide $\mathrm{C}_4 \mathrm{H}_9 \mathrm{Br}$, reacts with ethanolic KOH to form major compound $[\mathrm{A}]$ which reacts with bromine to give compound $[\mathrm{B}]$. Compound $[\mathrm{B}]$ reacts with ethanolic KOH and sodamide to give compound [C]. One molecule of water adds to compound [C] on warming with mercuric sulphate and dilute sulphuric acid at 333 K to form compound [D]. The functional group in compound D will be confirmed by :

• A. Haloform test
• B. Lucas test
• C. Silver mirror test
• D. Benedict test

Question 9 · difficulty L3 · understanding

$$\text { Given below are the four isomeric compounds }(\mathrm{P}, \mathrm{Q}, \mathrm{R}, \mathrm{~S})$$ Identify correct statements from below. A. $\mathrm{Q}, \mathrm{R}$ and S will give precipitate with 2, 4-DNP. B. $P$ and $Q$ will give positive Bayer's test. C. Q and R will give sooty flame. D. R and S will give yellow precipitate with $\mathrm{I}_2 / \mathrm{NaOH}$. E. Q alone will deposit silver with Tollen's reagent Choose the correct option.

• A. C and E only
• B. A and E only
• C. A, B, D and E only
• D. A, C and E only

Question 10 · difficulty L3 · understanding

The unsaturated ether on acidic hydrolysis produces carbonyl compounds as shown below :- Based on this, predict the solution/reagent that will help to distinguish "P" and "Q" obtained in the following reaction :-

• A. Saturated $\mathrm{NaHSO}_3$ solution
• B. Fehling solution
• C. Lucas reagent
• D. 2, 4 - DNP reagent