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1

### 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.
2

### 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.
3

### NEET 2016 Phase 1

The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha-carbon, is
A
a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation
B
a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism
C
a carbonyl compound with a hydrogen atom on its alpha-carbon never equilibrates with its corresponding enol
D
a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibration.

## Explanation

Keto-enol tautomerism is as follows :
4

### NEET 2016 Phase 1

Which of the following reagents would distinguish cis-cyclopenta-1-2-diol from the trans-isomer?
A
MnO2
B
Aluminimum isopropoxide
C
Acetone
D
Ozone

## Explanation

Trans isomer does not react with acetone as removal of H2O molecule is difficult.

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Class 12