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1

NEET 2017

MCQ (Single Correct Answer)
The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is
A
chromatography
B
crystallisation
C
steam distillation
D
sublimation.

Explanation

Steam distillation is the most suitable method of separation of 1 : 1 mixture of ortho and para nitrophenols as there is intramolecular hydrogen bonding in o-nitrophenol.
2

NEET 2017

MCQ (Single Correct Answer)
The correct statement regarding electrophile is
A
electrophile is a negatively charged species and form a bond by accepting a pair of electrons from another electrophile
B
electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile
C
electrophile can be either neutral or positively charged species and can form a bond by accepting a pair of electrons from a nucleophile
D
electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from a nucleophile.

Explanation

Electrophile can be either neutral or positively charged species and can form a bond by accepting a pair of electrons from a nucleophile.
3

NEET 2017

MCQ (Single Correct Answer)
The IUPAC name of the compound
A
5-formylhex-2-en-3-one
B
5-methyl-4-oxohex-2-en-5-al
C
3-keto-2-methylhex-5-enal
D
3-keto-2-methylhex-4-enal

Explanation

4

NEET 2016 Phase 1

MCQ (Single Correct Answer)
For the following reactions :

(A)  CH3CH2CH2Br + KOH $$ \to $$
                 CH3CH $$=$$ CH2 + KBr + H2O

Which of the following statements is correct?
A
(A) is elimination, (B) and (C) are substitution reactions.
B
(A) is substitution, (B) and (C) are addition reactions.
C
(A) and (B) are elimination reactions and (C) is addition reaction.
D
(A) is elimination, (B) is substitution and (C) is addition reaction.

Explanation

(A) Saturated compound is converted into unsaturated compound by removal of group of atoms hence, it is an elimination reaction.

(B) —Br group is replaced by —OH group hence, it is a substitution reaction.

(C) Addition of Br2 converts an unsaturated compound into a saturated compound hence, it is an addition reaction.

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