Which of the following is most basic in nature? from Chemistry A

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 Multiple Choice QuestionsMultiple Choice Questions

231.

Which of the following carbocations is expected to be most stable?


232.

The main product formed in the following reaction is


233.

The correct order of the basic strength of the following are

  • I>II>III>IV

  • IV>II>III>I

  • III>IV>II>I

  • III>II>IV>I


234.

In the reaction,


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235.

Which of the following sodium compound/compound (s) are formed when an organic compound containing both nitrogen and sulphur is fused with sodium?

  • Cyanide and sulphide

  • Thiocyanate

  • Sulphite and Cyanide

  • Nitrate and sulphide


236.

Which of the following is an example of carbylamine reaction?

  • 2Ph NH2 + CS2  (ii) conc. HCl(i) KOH Ph- NCS

  • R - NH2 + HNO2 0 - 5°C R - OH + N2 + HCl

  • Ph - NH2 + CHCl3 + 3KOH (alc.)  ph - NC + 3KCl + 3H2O

  • Ph2 - NH + HONO  Ph2 - N - N= O + H2O


237.

C3H9N reacts with Hinsberg reagent and the product is insoluble in alkali but soluble in ether. This nitrogen containing compound is

  • primary amine

  • secondary amine

  • tertiary amine

  • methyl isocyanide


238.

Which of the following compounds gives carbylamine test?

  • N-methyl-o-methyl aniline

  • N, N-dimethyl aniline

  • 2, 4-diethyl aniline

  • p-methyl-N-methyl benzylamine


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239.

Which of the following is 3° amine?

  • 1-methylcyclohexylamine

  • Triethyl amine

  • Tert-butylamine

  • N-methyl aniline


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240.

Which of the following is most basic in nature?

  • NH3

  • CH3NH2

  • (CH3)2NH

  • C6H5N(CH3)2


C.

(CH3)2NH

Basicity of amines depends upon the availability of lone pair of nitrogen for donation. Electron mreleasing group like -CH3 increases the basicity of amines by increasing electron density over nitrogen, which facilitate the donation of lone pair of electrons.

Electron withdrawing groups like -Ph group withdraws electrons and thus, make amines less basic by decreasing electron density over nitrogen. Hence, the order of basic nature of the given amines is

(CH3)2NH > C6H5N(CH3)2 > CH3NH2 > NH3

Thus, (CH3)2NH is most basic.


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