Question

Which of the following will produce isopropyl amine –
(I) (CH₃)₂CO→┴(NH₂OH )X □(→┴(LiAlH₄)
(II) CH₃ - CH₂ - CHO→┴(NH₃ )X□(→┴(LiAlH₄)
(III) (CH₃ )₂CH -OH + PCl₅ →X →┴(NH₃ )
(IV) CH₃- CH₂- CH₂- NH₂ □(→┴Neat )
(a) I, II (b) II, III
(c) I, III (d) IV only

Answer 1

Explanation:

Which of the following will produce isopropyl amine –

(I) (CH₃)₂CO→┴(NH₂OH )X □(→┴(LiAlH₄)

(II) CH₃ - CH₂ - CHO→┴(NH₃ )X□(→┴(LiAlH₄)

(III) (CH₃ )₂CH -OH + PCl₅ →X →┴(NH₃ )

(IV) CH₃- CH₂- CH₂- NH₂ □(→┴Neat )

(a) I, II (b) II, III

(c) I, III

(d) IV only

Answer 2

Options 1 and 3 will produce the desired product.

Explanation:

• The reagent in the 1st case is acetone.

• Its reacted with NH2OH.

• This will produce the product (CH3)2 C=NH.

• This compound when treated with Lithium aluminium hydride reduces the product to form isopropyl amine.

• In the 3rd reaction, the reactant is isopropyl alcohol.

• When this product is treated with PCl5, the product is isopropyl chloride.

• This product when heated with ammonia, produces isopropyl amine and hydrogen chloride gas.

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