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Chemistry MCQs for NEET — Practice Questions with Answers

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Which of the following hormones contains iodine?

Insulin

Testosterone

Adrenaline

Thyroxine

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Vitamin- B₁₂ contains

Zn (II)

Ca (II)

Fe (II)

Co (II)

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Explanation

The molecular formula of vitamin-B12 is C₆₃H₈₄ N₁₄O₁₄ PCO and the chemical name is cyanocobalamine. So, cobalt is present in vitamin-B₁₂.

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Commonly used antiseptic 'Dettol' is a mixture of

o-chlorophenoxylenol + terpineol

o-cresol + terpineol

phenol + terpineol

chloroxylenol + terpineol

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Explanation

(d) Dettol is an antiseptic. It is a mixture of chloroxylenol and terpineol in a suitable solvent.

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Reactivity order of halides for dehydrohalogenation is

R-F>R-Cl>R-Br>R-I

R-I>R-Br>R-Cl>R-F

R-I>R-Cl>R-Br>R-F

R-F>R-I>R-Br>R-Cl

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Explanation

(b) F,Cl,Br and I are the elements of VII A group. In a group atomic radii increases from top to bottom and the bond dissociation energy decreases as

R-F>R-Cl>R-Br>R-I

So, during dehydrohalogenation R-I bond breaks more easily than R-I bond. Hence, order of reactivity will be

R-I>R-Br>R-Cl>R-F

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$PhOH \to_{NaOH}^{{Me}_{2} {SO}_{4}} P,$ P is

Ph–O–SO₂OMe

PhOMe

PhOSO₂OPh

PhMe

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(CH₃)₃CCI + (CH₃)₃CO – K⁺ → Product

S_N Product will be more

E₂ Product will be more

both will be the same

None of these

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Explanation

Sterically hindered base leads to elimination products.

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Conversion of cyclohexene to cyclohexanol can be conveniently achieved by:

NaOH + H₂O

Br₂-H₂O

hydroboration, oxidation

hydroboration hydrolysis

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Explanation

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Bromination of (E)-2-butenedioic acid gives

(2R, 3S)-2, 3-dibromosuccinic acid

(2R, 3R)-2, 3-dibroniosuccinic acid

a mixture of (2R, 3R) and (2S, 3S)-2, 3-dibromosuccinic acid

(2S, 3S)-2, 3-dibromosuccinic acid

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Explanation

(a) Anti-addition take place.

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The electrophilic aromatic substitution proceeds through a:

free radical

sigma complex

benzyne

carbene

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Explanation

The electrophilic aromatic substitution proceeds through the formation of a sigma complex. In this reaction, the electrophilic species (like a carbocation) attacks the aromatic ring, forming a cyclohexadienyl cation intermediate, which is a sigma complex.

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Which of the following substitution of benzene is ortho-para in electrophilic substitution and ortho-para in nucleophilic substitution ?

-NO₂

-NO

-SO₃H

-SO₂Me

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Explanation

(b) -N=O has +M and -M effect depend upon type of group attached.

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