Question # 1

An stereospecific enzyme in one which catalyses

Choose an answer

Formation of one stercolsomer

Reaction of one stereoisomer only

Both of these

None of these

The decomposition of dimethyl ether at 504 oC is first order with a half -life of 1570 second. What fraction of an initial amount of dimethyl ether remain after 47-10 seconds.

Choose an answer

1/3

1/6

1/8

1/16

All bond length in benzene are identical due to.

Choose an answer

Resonance effect

Inductomeric effect

Electromeric effect

Mesomeric effect

In hydrogen bonding a hydrogen atom is bonded to which of the highly electronegative atoms.

Choose an answer

N

O

F

N,O,F

Which of the following statement in not correct with respect to inductive effect.

Choose an answer

Bond length decrease with increase in inductive effect.

Inductive effect generates polar character in bonds

Variation in strength of aliphatic acids can be explained

It alone cna explain the basically of triphenylamine

In the presence of dilute alkali monosaccharides undergo reversible isomerisation . The reaction known as.

Choose an answer

Kiliani reaction

Weermann rearrrangement

Lobry do Bruyn Van Ekenstein rearrangement

Mutarotation

Oil of turpentine contains.

Choose an answer

a-pinene

p- pinene

Both A and B

None of these

Hydrogen bons holding the strand to nucleic acids are formed between

Choose an answer

Sugar and base units

Base unit

Sugar ane phosphate units

Sugar units

A group that causes deepning of the colour is known as

Choose an answer

Bathchromic

Hypsochromic

Hypochromic

Hyperchromic

In which of the following group, each member given a positive iodoform test.

Choose an answer

Methanol, ethanol, propanone

Ethanol, isopropyl alcohol, methanol

Ethanol, ethanal, isopropyl alcohol

Propanal 2-propanol, propanone

What is the activation energy of a reaction whose rate constant increases by a factor of 100 upon increasing the temperature from 300 K to 360 K.

Choose an answer

27

35

42

69

The addition of Br2 to cis 2-butene produces.

Choose an answer

(+) 2,3 - dibromobutane only

(-) 2,3 -dibromobutane only

(+) 2,3, dibromobutane

meso-2,3, -dibromobutane

The greater stability of bonzyl carbonium ion as compared to t-butyl carbonium ion is due to.

Choose an answer

Inductive effect

Resonance effect

Electrometric effect

All above

Beillstein test is used for.

Choose an answer

Cl

N2

CO2

Na

The compounds whose formation require a host compound and a guest compound are called.

Choose an answer

Exclusion compounds

Inclusion compounds

Crystal compounds

None of the above

Enzymatic action is heat at a fixed

Choose an answer

Temparature

pH

Both of these

None of these

Which of the following compound will be optically active.

Choose an answer

Suceinic acid

Meso tartaric acid

Acetic acid

Lactic acid

In propagation step the reaction intermediate of radical polymerization is

Choose an answer

Carbocation

Carbonion

Free radical

Carbene

Cytosine a pyrimidine base pairs with

Choose an answer

Guanine

Thymine

Adenine

Any of these

In the Friedel-Craft acylation, the amount of AlCl3 tha tmust be taken is

Choose an answer

In catalytic amount

One equivalent

More then one equivalent

Amount does not matter

The terpenoid present in oil of lemon grass is

Choose an answer

Citral

Geranial

Nerol

a- terpineol

More Classes

Other Links

PPSC Chemistry Part II Organic Chemistry Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer