Question # 1

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.

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1/3

1/6

1/8

1/16

The addition of HCl in the presence of poroxule does not follow anti Markovnikov's rule because.

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HCl bond is too strong to be broken homolytically

Cl atom is not reative enough to add on to a double bond

Cl combines with H to give back HCl

HCl is a reducing agent.

Select the major product obtained from the addition HBr to 1-methyl cyclohexene.

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1- bromo -2- methyl cyclohexane

6- bromo-1- methyl cyclohex - 1- ene

3- bromo-1- methyl cyclohex -1- ene

1- bromo-1- methyl cyclohexane

The bond length of C = C is

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1.20 A^o

1.34 A^o

1.54 A^o

1.68 A^o

The sugar present in DNA is

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D- Ribose

D-Glucose

2- Doxy D-Ribose

3-Deoxy D-ribose

An example of acrylic monoterpenoid is

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Dipentene

Myocene

a- terpineol

Limonene

Phosphorus is detected by fusing the organic compound with -------followed by extraction with H2O

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HNO3

H2SO4

Sodium per oxide

Ozone

Each of the following compound is an aromatic except.

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Benzene

Naphthalene

Cyclopentadienyl cation

Cyclopentadienyl anion

The addition of Br2 to cis 2-butene produces.

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(+) 2,3 - dibromobutane only

(-) 2,3 -dibromobutane only

(+) 2,3, dibromobutane

meso-2,3, -dibromobutane

D(+) glyceraldebydes has the absolute configurtion.

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E-

S-

E-

Z-

Dyes used in photographic plates to make them panchromatic is.

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Cyanine dyes

Azine dyes

Phthalocyanine dyes

Acridine dyes

Which of the following polymers is chlorinated.

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Orlon

Neoprene

Dacron

None of these

Which of the following statements do not represent Lewis idea of acids and base?

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Compounds which have completely filled orbitals

Compounds which have incompletely filled orbitals

Compounds in which the central atom can expand its octel

All simple metal ions like Ag+, Al3+ etc.

Which of the following is branch chain polymer.

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Glycogen

Terylene

PVC

Orlen

When FeSO4 is added in the sodium extract the compound formed is.

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Only Na4[Fe (CN)6]

Only Fe (OH)2

Only Na2So4

Mixture of all these

Suppose the activatin energy of a certain reaction is 250 kj/mol, If the rate constant at T1 =300 K is k1 and the rate constant at T2= 320 K is ks, then the reaction is ______ times faster at 320 K than at 300 K

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3 x 10^-29

0.067

525

15.0

a- pinene hydrochloride on warming rdarranges to form bornyl chloride.The rearrangement is known as.

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Pinacol pinacolone

Hofinann

Wager Mecrwein

Wolff

Codon for amino acid glycinc is not represented by base pair

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GCA

GGC

GGA

GGU

Two solids A and B have appreciable different solubility in water but their m.p. are very close. The mixture A and B can be separated by.

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Sublimation

Distillation

Fractional crystallization

Specific rotation

Soft drinks and baby feeding bottles are generally made up

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Polyeater

Polyurethens

Polyamide

Polyetyrene

The product obtained on heating n-heptane with Cr2O3 ____Al2O3 at 600 ^oC is.

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Cycloheptane

Methyl cyclohexane

Benzene

Teluene

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