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Positive Tollen's test is observed for...

Positive Tollen's test is observed for

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
A, B, C
`alpha,beta`-unsaturated aldehydes, aromatic aldehydes and `alpha`-hydroxyketones all give tollens' test but ketones (including `alpha,beta`-unsaturated) do not give this test. Thus, option (a,b and c) are correct.
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Explore conceptually related problems

Positive Tollen 's test is oberveved for

(A), (B) and (C ) are three non-cylic funtional isomers of a carbonyl compound with molecular formula C_(4)H_(8)O . Isomers (A) and (C ) give positive Tollen's test whereas isomer (B) does not give Tollens' test but gives positive iodoform test. Isomers (A) and (B) on reduction with Zn(Mg) | conc. HCl give the same product (D). (a) Write the structures of (A), (B) ,(C) and (D). (b) Out of (A), (B) and (C ) isomers, which one is least reactive towards addition of HCN ?

(A) A(C_(7)H_(14)) overset(O_(3)//Red)(rarr)B(C_(3)H_(6)O)+C (B) Gives positive Tollens test but negative iodform test. (C ) Give negative Tollens test but positive iodoform test. The compound (B) can be converted to (C ) by using the reagents:

(A) A(C_(7)H_(14)) overset(O_(3)//Red)(rarr)B(C_(3)H_(6)O)+C (B) Gives positive Tollens test but negative iodform test. (C ) Give negative Tollens test but positive iodoform test. The compound (A) is:

(A) A(C_(7)H_(14)) overset(O_(3)//Red)(rarr)B(C_(3)H_(6)O)+C (B) Gives positive Tollens test but negative iodform test. (C ) Give negative Tollens test but positive iodoform test. The compound (C ) is:

(A) A(C_(7)H_(14)) overset(O_(3)//Red)(rarr)B(C_(3)H_(6)O)+C (B) Gives positive Tollens test but negative iodform test. (C ) Give negative Tollens test but positive iodoform test. The compound (B) is:

Knowledge Check

  • Positive Tollen 's test is oberveved for

    A
    B
    C
    D

  • Choose the correct optically active isomer of C_(6)H_(12)O that gives a positive Tollen's test and does not racemise in base.

    A
    `H_(3)C -CH_(2)-CH_(2)-underset(CH_(3))underset(|)CH-CHO`
    B
    `H_(3)C -CH_(2) - underset(CH_(3))underset(|)CH- overset(O)overset(||)C-CH_(3)`
    C
    `H_(3)C-CH_(2)-underset(CH_(3))underset(|)(CH) -CH_(2)-CHO`
    D
    `H_(3)C - underset(CHO)underset(|)CH-overset(CH_(3))overset(|)CH-CH_(3)`

  • (A) A(C_(7)H_(14)) overset(O_(3)//Red)(rarr)B(C_(3)H_(6)O)+C (B) Gives positive Tollens test but negative iodform test. (C ) Give negative Tollens test but positive iodoform test. The compound (B) can be converted to (C ) by using the reagents:

    A
    a.i. `EtMgBr//H_(3)O^(o+)`, ii. `Acidic KMnO_(4)`
    B
    b.i. `MeMgBr//H_(3)O^(o+)`, ii. `Acidic KMnO_(4)`
    C
    c.i. `EtMgBr//H_(3)O^(o+)`, ii. `Aqueous KMnO_(4)`
    D
    d.i. `MeMgBr//H_(3)O^(o+)`, ii. `Aqueous KMnO_(4)`