The enol form of acetone after treatment with D₂O gives:

1. $OD$
$|$
${CH}_{3} — C = {CH}_{2}$

2. $O$
$| |$
${CH}_{3} — C — {CD}_{3}$

3. $OH$
$|$
${CH}_{2} = C — {CH}_{2} D$

4. $OD$
$|$
${CD}_{2} = C — {CD}_{3}$

Subtopic: Structural Isomers |

59%

Level 3: 35%-60%

1

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4

Hints

Q282:

Maleic and fumaric acids are:

1. tautomers

2. geometrical isomers

3. chain isomers

4. functional isomers

Subtopic: Stereo Isomers |

65%

Level 2: 60%+

1

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4

Hints

Q283:

Isomers which can be interconverted through rotation around a single bond are:

1. Conformers

2. Diastereomers

3. Enantiomers

4. Positional isomers

Subtopic: Conformational Isomers |

81%

Level 1: 80%+

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4

Hints

Q284:

How many structures of F are possible?

(1) 2

(2) 5

(3) 6

(4) 3

Subtopic: Conformational Isomers |

Level 4: Below 35%

1

2

3

4

Hints

Q285:

The optically active alkane with lowest molar mass is:

1. ${CH}_{3} {CH}_{2} C \equiv CH$

2. ${CH}_{3} {CH}_{2} - \overset{{CH}_{3}}{\overset{|}{CH}} - {CH}_{3}$

3.

4. ${CH}_{3} {CH}_{2} . {CH}_{2} {CH}_{3}$

Subtopic: Stereo Isomers |

70%

Level 2: 60%+

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Hints

Q286:

a-D-(+)-glucose and β-D-(+)-glucose are :

(1) enantiomers

(2) conformers

(3) epimers

(4) anomers

Subtopic: Conformational Isomers |

Level 3: 35%-60%

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Hints

Q287:

The absolute configuration of

is:

(1) S, R

(2) S, S

(3) R, R

(4) R, S

Subtopic: Stereo Isomers |

Level 3: 35%-60%

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Hints

Q288:

The correct statement regarding electrophile is

1.	Electrophile is a negatively charge species and can form a bond by accepting a pair of electrons from a nucleophile
2.	Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electrophile
3.	Electrophile can be either neutral or positively charged species and can form a bond by accepting a pair of electrons from a nucleophile
4.	Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile

Subtopic: Nucleophile & Electrophile |

Level 4: Below 35%

NEET - 2017

1

2

3

4

Hints

Q289:

Which of the following statements is true regarding the conformers of ethane?

1.	Bond angle remains the same but bond length changes.
2.	Bond angle changes but bond length remains the same.
3.	Both bond angle and bond length change.
4.	Both bond angle and bond length remain the same.

Subtopic: Conformational Isomers |

Level 3: 35%-60%

NEET - 2017

1

2

3

4

Hints

Q290:

The IUPAC name of the compound

is-

1. 3-Keto-2-methylhex-4-enal

2. 5-Formylhex-2-en-3-one

3. 5-Methyl-4-oxohex-2-en-5-al

4. 3-Keto-2-methylhex-5-enal

Subtopic: Nomenclature |

70%

Level 2: 60%+

NEET - 2017

1

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Hints

The enol form of acetone after treatment with D₂O gives:

1. $OD$
$|$
${CH}_{3} — C = {CH}_{2}$

2. $O$
$| |$
${CH}_{3} — C — {CD}_{3}$

3. $OH$
$|$
${CH}_{2} = C — {CH}_{2} D$

4. $OD$
$|$
${CD}_{2} = C — {CD}_{3}$

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The enol form of acetone after treatment with D2O gives: 1. OD|CH3—C=CH2 2. O||CH3—C—CD3 3. OH|CH2=C—CH2D 4. OD|CD2=C—CD3

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The enol form of acetone after treatment with D₂O gives:

1. $OD$
$|$
${CH}_{3} — C = {CH}_{2}$

2. $O$
$| |$
${CH}_{3} — C — {CD}_{3}$

3. $OH$
$|$
${CH}_{2} = C — {CH}_{2} D$

4. $OD$
$|$
${CD}_{2} = C — {CD}_{3}$