Problem 30
The products obtained via oxymercuration \(\left(\mathrm{HgSO}_{4} 1 \mathrm{II}_{2} \mathrm{SO}_{4}\right)\) of 1 -butyne would be (1) \(\mathrm{CII}_{3} \mathrm{CH}_{2} \mathrm{COCII}_{3}\) (2) \(\mathrm{CII}_{3} \mathrm{CH}_{2} \mathrm{CII}_{2}\) CIIO (3) \(\mathrm{CII}_{3} \mathrm{CH}_{2} \mathrm{CIIO}+\mathrm{HCHO}\) (4) \(\mathrm{CII}_{3} \mathrm{CH}_{2}\) COOII I ICOOII
Problem 32
Which of the following alkyne give aldehyde on reaction with dil. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) in the presence of \(\mathrm{HgSO}_{4}\) ? (1) propyne (2) 1 -butyne (3) ethyne (4) all of these
Problem 34
Dry heavy metal alkynides are (1) reducing agents (2) poisonous (3) oxidizing agents (4) explosive
Problem 35
Which of the following type of reaction occurs when I-butyne reacts with HBr? (1) an electrophitic addition (2) Markownikoff's electrophilic addition (3) anti-Markownikoff's radical addition (4) None of the above
Problem 37
The addition of water to propyne in the presence of \(\mathrm{HgSO}_{4}-\mathrm{H}_{2} \mathrm{SO}_{4}\) gives (1) \(\mathrm{CII}_{3} \mathrm{CH}=\) CIIOII (2) (3) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}\) (4) \(\mathrm{CH}_{3} \mathrm{COCH}_{3}\)
Problem 39
When two moles of ethyne are passed through \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\) dissolved in ammonium chloride solution the product is (1) 1 -butyne (2) vinyl acetylenc (3) divinyl acctylene (4) chloroprenc
Problem 40
Vinyl acetylene reacts with one equivalent of \(\mathrm{HCl}\) to produce (1) chloroprene (2) neoprene (3) lewisite (4) mesitylene
Problem 42
Passing two moles of acetylene and one mole of hydrogen cyanide through a red hot tube yields (1) pyrole (2) pyridine (3) ethyl amine (4) diethyl amine
Problem 43
1,1-Dibromopentane on treatment wtih sodamide followed by reaction with \(\mathrm{H}_{3} \mathrm{O}^{+}\) gives (1) 2 -pentyne (2) 3 -mcthyl butyne-1 (3) 1-pentyne (4) \(n\) -propyl cthyne
Problem 44
Which of the following statements is correct? (1) alkynes are more reactive than alkenes towards halogen addition (2) alkynes are less reactive than alkenes towards halogen addition (3) both alkynes and alkenes are cqually reactive towards halogen addition (4) primary vinylic cation \((\mathrm{RCII}=\mathrm{CII})\) is more rcactive than sccondary vinylic cation \(\left(\mathrm{RC}=\mathrm{CII}_{2}\right)\)
