All MCQs for Competitive Exams

11

What is the chemical formula for chloroform?

A

CHCl3

B

CH4

C

C2H6

D

CCl4

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12

Alkyl halides are considered to be very reactive compounds towards nucleophile because_________________?

A

they have an electrophilic carbon

B

they have an electrophilic carbon & a bad leaving group

C

they have a nucleophilic carbon & a good leaving group

D

they have an electrophilic carbon & a good leaving group

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13

Most reactive metal among the following is

A

Silver

B

Sodium

C

Magnesium

D

Gold

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14

Which halogen reacts very slowly with other halogens?

A

Iodine

B

Fluorine

C

Chlorine

D

Bromine

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15

Ketones are comparatively less reactive than aldehdye. It is due to_______________?

A

alkyl groups are electron donating

B

steric hindrance

C

none

D

Both A and B

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16

The most reactive allotropic form of phosphorus is________________?

A

Violet

B

Redox potential

C

White

D

Black

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17

Which category of enzymes is responsible for splitting a substrate molecule into two distinct components?

A

Isomerases

B

Oxidation-reduction enzymes

C

Hydrolases

D

Adding enzymes

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18

Which of the following enzymes is classified as a transferase?

A

Glutamic-aspartic transaminase

B

Phosphoglutaric isomerase

C

Esterase

D

Glutamic decarboxylase

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19

What is the collective term for the enzymes secreted by yeast cells onto their substrate?

A

Proteinase

B

Lyase

C

Lygase

D

Zymase

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20

Match the biochemical reactions with their corresponding enzyme classes.

A

a-2, b-4, c-3, d-1

B

a-2, b-3, c-4, d-1

C

a-1, b-3, c-4, d-2

D

a-1, b-3, c-2, d-4

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