Entry Test MCQ :: Alkyl Halides

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21.

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 good leaving group
C.	they have an electrophilic carbon & a bad leaving group	D.	they have a nucleophilic carbon & a good leaving group

22.

Which one of the following species is not an electrophile?

A.	NH3	B.	Br+
C.	H+	D.	BF3

23.

Which one of the following reactants will be required to form straight chain alcohol by using Grignard reagent

A.	formaldehyde	B.	ketone
C.	ethylene epoxide	D.	both a & c

24.

Which one of the following alcohols will be formed when ethyl magnesium bromide reacts with acetone?

A.	primary alcohol	B.	secondary alcohol
C.	tertiary alcohol	D.	dihydric alcohol

25.

Which one of the following molecules does not form alcohol when reacts with Grignard reagent?

A.	formaldehyde	B.	acetaldehyde
C.	propanone	D.	carbondioxide

26.

In primary alkyl halides the halogen atom is attached to a carbon which is further attached to how many carbon atoms

A.	two	B.	three
C.	one	D.	four

27.

Ethylene epoxide treated with Grignards reagent followed by acid hydrolysis yield

A.	primary alcohol	B.	secondary alcohol
C.	tertiary alcohol	D.	dihydric alcohol

28.

The best method of preparation of alkyl halides is a reaction of alcohol with

A.	Zn / HCI	B.	SOCl2 / Pyridine
C.	PCI3	D.	PCI5

29.

Alkyl halides undergo a type of reaction

A.	Nucleophilic substitution	B.	Nucleophilic addition
C.	Elimination	D.	both a & c

30.

50% inversion of configuration of molecules take place in a

A.	E1 - reaction	B.	E2 - reaction
C.	SN1 - reaction	D.	SN2 - reaction