1
MCQ (Single Correct Answer)

NEET 2017

Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating?
A
B
C
D

Explanation

2
MCQ (Single Correct Answer)

NEET 2017

Consider the reactions,

Identify A, X, Y and Z.
A
A-Methoxymethane, X-Ethanol,
Y-Ethanoic acid, Z-Semicarbazide.
B
A-Ethanal, X-Ethanol,
Y-But-2-enal, Z-Semicarbazone.
C
A-Ethanol, X-Acetalfehyde,
Y-Butanone, Z-Hydrazone.
D
A-Methoxymethane, X-Ethanoic acid,
Y-Acetate ion, Z-Hydrazine.

Explanation

Since, A gives silver mirror test, it must be an aldehyde and aldehydes are formed by oxidation of 1o alcohols. Thus, ‘X’ is a 1o alcohol, i.e., CH3CH2OH.
3
MCQ (Single Correct Answer)

NEET 2016 Phase 2

The correct structure of the product 'A' formed in the reaction
A
B
C
D

Explanation



When H2, Pb/C catalyst is used then C=C is reduced at faster rate than C=O bond.
4
MCQ (Single Correct Answer)

NEET 2016 Phase 2

The correct order of strengths of the carboxylic acids

is
A
I > II > III
B
II > III > I
C
III > II > I
D
II > I > III

Explanation

We know, Acidic strength $$ \propto $$ – I effect

As oxygen is more electron withdrawing (II) and (III) show greater – I effect than (I). Thus, (I) is least acidic. Out of (II) and (III), (II) is more acidic than (III) as distance of O increases from —COOH group and acidic strength decreases.

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