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351.

show by chemical equactions only how would you prepare the following from the indicated starting materials. Specify the reagents in each step of synthesis of: i. Chloroform from carbon disulphide. ii. Hexachlorothane `(C_(2) Cl_(6))` from calcium carbide.

Answer» i. `CS_(2) + Cl_(2) rarr CCl_(4) + S_(2) Cl_(2)`
`CS_(2) + 2SCl_(4) + 6S`
`C Cl_(4) + 2 [H] overset(Fe//H_(2)O)(rarr) underset("Chloroform")(CHCl_(3)) + HCl`
ii. `CaC_(2) + H_(2) O rarr C_(2) H_(2) + Ca(OH)_(2)`
`C_(2) H_(2) overset(Ni//H_(2))(rarr) CH_(3) - CH_(3)`
`CH_(3) - CH_(3) underset("prolonged treatment") overset(Cl_(2) "(excess).light")(rarr) underset("Hexachloroethane")(Cl_(3)C - C Cl_(3))`
Discussion
352.

Aniline when diazotied in cold and then treated with dimethyl aniline gives a coloured product. Its structure would be:A. B. C. D.

Answer» Correct Answer - A
Discussion
353.

Aniline when diazotized in cold and then treated with dimethyl aniline gives a coloured product. Its structure would beA. B. C. D.

Answer» Correct Answer - A
Discussion
354.

Fluorobenzene `(C_(6)H_(5)F)` can be synthesized in the laboratory .A. from aniline by diazotisation followed by heating the diazonium salt with `HBF_(4)`B. by direct fluorination of benzene with `F_(2)` gas.C. by reacting bromobenzene with NaF solution.D. by heating phenol with HF and KF.

Answer» Correct Answer - A
Discussion
355.

organic compound sometimes adjust their electronic as well as steric structures to attain stability. Among the following, the compound having highest dipole moment is:A. B. C. D.

Answer» Correct Answer - D
Discussion
356.

Consider the pathway of a well known organic reaction Which step is rate determining step?A. formation of IIB. formation of IIIC. formation of VD. formation of IV

Answer» Correct Answer - D
Discussion