Question

QUESTION 18:

Which of the following compounds gives a 1M aqueous solution having the highest pH?

	A.	(CH3)4N+OH–
	B.	(CH3)4N+Cl–
	C.	(CH3)3N
	D.	(CH3)3NH+Cl–

QUESTION 19:

The overall conversion RBr →→ RCH₂NH₂ can be accomplished by successive application of which of these sets of reagents?

	A.	Mg, ether; then NH3
	B.	NaN3; then LiAlH4
	C.	NaCN; then LiAlH4
	D.	H2C=O; then NH3
	E.	H2NOH; then LiAlH4

QUESTION 20:

Which sequence is suitable for preparing butylamine from 1-propanol?

	A.	KMnO4, then SOCl2, then NH3, then Br2 and NaOH
	B.	PBr3, then NaN3, then H2/Pt
	C.	PBr3, then NaCN, then H2/Pt
	D.	PBr3, then Mg, then NaCN, then H2/Pt
	E.	none of these

Answer 1

Question 18. Option A

Explanation: Option A contains OH- ion.

Question 19. Option C

Explanation: NaCN gives alkyl cyanide, then LiAlH4 gives primary amine.

Question 20. Option C

Explanation: PBr3 gives propyl bromide, NaCN give butyl nitrile, H2, Pt gives butylamine.