1
MCQ (Single Correct Answer)

NEET 2017

Which one is the most acidic compound?
A
B
C
D

Explanation

Electron withdrawing group at o and p-position w.r.t. OH group of phenol, increase the acidic strength.

Picric acid (2, 4, 6-trinitrophenol) is extremely more acidic among the given compounds due to the presence of three strong electron withdrawing groups ( NO2 group) at ortho and para-positions.
2
MCQ (Single Correct Answer)

NEET 2017

The heating of phenyl methyl ether with HI produces
A
iodobenzene
B
phenol
C
benzene
D
ethyl chloride.

Explanation

In case of phenyl methyl ether, methyl phenyl oxonium ion

is formed by protonation of ether. The O—CH3 bond is weaker than O—C6H5 bond as O—C6H5 has partial double bond character. Therefore, the attack by I– ion breaks O—CH3 bond to form CH3I.
3
MCQ (Single Correct Answer)

NEET 2016 Phase 1

The reaction


can be classified as
A
dehydration reaction
B
Williamson alcohol synthesis reaction
C
Williamson ether synthesis reaction
D
alcohol formation reaction.

Explanation

The treatment of sodium alkoxide with a suitable alkyl halide to form an ether is called as Williamson ether synthesis reaction.
4
MCQ (Single Correct Answer)

AIPMT 2015

Which of the following reaction(s) can be used for the preparation of alkyl halides?

A
(I) and (II) only
B
(IV) only
C
(III) and (IV) only
D
(I), (III) and (IV) only

Explanation

Lucas reagent [HCl + ZnCl2] can be used for
1o / 2o / 3o-alcohol but if ZnCl2 is absent then only 3o alcohol can be used because it is most reactive due to 3o carbocation.

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