Higher Alkynes from Alkynes

Q. Acetylene is treated with excess sodium in liquid ammonia. The product is reacted with excess of methyl iodine. The final product is

1. But-1-yne
2. but-1-ene
3. but-2-yne
4. but-2-ene

Q. In the reaction $H-C\equiv CH\underset{\left(2\right)C{H}_{3}C{H}_{2}Br}{\overset{\left(1\right)NaN{H}_2/liq.N{H}_3}{\to }}X\underset{\left(2\right)C{H}_{3}C{H}_{2}Br}{\overset{\left(1\right)NaN{H}_2/liq.N{H}_3}{\to }}Y,$ Xand Y are:

1. X = 1 - Butyne; Y = 3 - Hexyne
2. X = 2 - Butyne; Y = 3 - Hexyane
3. X = 2 - Butyne; Y = 2 - Hexyane
4. X = 1 - Butyne; Y = 2 - Hexyane

Q. Alkyl halide can be converted into alkene by:

1. Nucleophilic substitution reaction
2. Elimination reaction
3. Both nucleophilic substitution and elimination reaction
4. Addition reaction

Q. CD_2=CH-CH_2Br is subjected to S_N1 and S_N2 reactions separately, which of the following statement is correct? (1) Both S_N1 and S_N2 give two products (2) Both S_{N }1 and SN2 give only one product (3) S_{N }1 gives two products but S_N2 gives only one product (4) S_N1 gives one product but S_N2 gives two produ

Q. Which of the following alkyl halides can produce only a single alkene product when treated with sodium methoxide?

1. 2-chloro-2-methyl pentane
2. 3-chloro-3-ethyl pentane
3. 3-chloro-2-methyl pentane
4. 2-chloro-4-methyl pentane

Q. The incorrect statement regarding C is:

1. Compound C is $C{H}_3-C\equiv C-C{H}_3$
2. C answers positive Tollens’ test
3. In compound C, all the four carbons are linear
4. Compound C on ozonolysis gives a diketone

Q. Which one of the following product formed when the reaction of phenol with benzoyl chloride in the presence of alkali takes place?

1. Benzyl phenate
2. Benzyl benzoate
3. Phenyl benzoate
4. Benzoyl phenate

Q. What is the final product $C$, of the following reaction sequence?

1. 
2. 
3. 
4. 

Q. $C_2{H}_2\underset{dil.H_{2}S{O}_4}{\overset{HgS{O}_4}{\to }}P\stackrel{\left[O\right]}{\to }Q\stackrel{SOC{l}_2}{\to }R\underset{Pd-BaS{O}_4}{\overset{H_2}{\to }}S$

The end product in the above sequence of reactions is:

1. Ethyl ethanol
2. Ethanal
3. Propanal
4. Propanol

Q. Which of the following reaction(s) follow $S_{N}1$ mechanism?

1. Reaction of diazonium salt with water
2. Reaction of tert-butyl alcohol with $HI$
3. Reaction of Prop-2-en-1-ol with $HI$
4. All of the above.

Q. Starting from acetylene and any alkyl halide, which of the following yields cyclodecyne?

1. 1 eq. $NaN{H}_2$ and $Br(C{H}_2{)}_{9}Br$
2. 2 eq. $NaN{H}_2$ and $Br(C{H}_2{)}_{8}Br$
3. 1 eq. $NaN{H}_2$ and $Br(C{H}_2{)}_{8}Br$
4. Both b and c

Q. End product (C) in above reaction is :

1. 
2. 
3. 
4. 

Q.
Which of the following compounds can bring the given conversion?

1. $KOH,C{H}_{3}C{H}_{2}Br$
2. (b) and (c) above
3. $NaN{H}_2,C{H}_{3}CHO$
4. $NaN{H}_2,C{H}_{3}C{H}_{2}C{H}_{2}Br$

Q. Which of the following cannot be cleaved by periodic acid?

1. 
2. 
3. 
4. 

Q. 1, 2-Dibromoethane on treatment with X moles of $NaN{H}_2$ followed by treatment with $C_2{H}_{5}Br$ gives a butyne. The value of X is:

Q. Which of the following will go by $\alpha -$ elimination reaction mechanism?

1. $(C{H}_3{)}_{3}CI\underset{\Delta }{\overset{H_{2}O}{\to }}$
2. $C{H}_3-C{H}_2-C{H}_2-Cl\underset{\Delta }{\overset{alc.KOH}{\to }}$
3. $CHC{l}_3\underset{\Delta }{\overset{KOH}{\to }}$
4. $(C{H}_3{)}_{3}C-OH\underset{H_3{O}^{+}}{\overset{H_{2}S{O}_4,\Delta }{\to }}$

Q. The following is used for metal cleaning and finishing

1. $CH{l}_3$
2. $CHC{l}_3$
3. $C{H}_{2}C{l}_2$
4. $C_6{H}_6$

Q. $Inordertocompletethereaction$

$1-Pentyne\stackrel{a}{\to }4-Octane\stackrel{b}{\to }cis-4-Octaneaandbwillbe$

$\left(1\right)NaN{H}_2;\stackrel{a}{C{H}_{3}C{H}_{2}Br}:H_2\stackrel{b}{\left(onemole\right)}PdorNi$

$\left(2\right)NaN{H}_2;C{H}_{3}C{H}_{2}C{H}_{2}Br:H_2\left(twomoles\right)PdorNi$

$\left(3\right)NaN{H}_2;C{H}_{3}C{H}_{2}C{H}_{2}Br:H_2,(one-mole)PdorNi$

$\left(4\right)NaN{H}_2;C{H}_{3}C{H}_{2}C{H}_{2}Br:B{H}_3,H_2{O}_2,O{H}^{-}$

1. 2
2. 3
3. 4
4. 1

Q. Which of the followings reagents forms an isonitrile when reacted with an alkyl halide?

1. $KCN$
2. $AgCN$
3. $KN{O}_2$
4. (a) and (b) above.

Q. CH3-Ch=Ch-C_=Ch ----Hbr--->a The product a is (1)CH3 -Ch -Br -ch2- c_=ch (2)CH3 CH CH BR ch2

Q. The incorrect statement regarding C is:

1. Compound C is $C{H}_3-C\equiv C-C{H}_3$
2. C answers positive Tollens’ test
3. In compound C, all the four carbons are linear
4. Compound C on ozonolysis gives a diketone

Q. Draw the electron dot structure of Propanone.

Q. Accomplish the following conversion. Assume general laboratory reagents are available at your disposal; Multiple steps may be needed:

1. 1. $B{r}_2/C{H}_{2}C{l}_2$; 2. $Et{O}^{-}/EtOH$ 3. $B_2{H}_6$, followed by $H_2{O}_2,O{H}^{-}$
2. 1. $B{r}_2/C{H}_{2}C{l}_2$; 2. $Et{O}^{-}/EtOH$ 3. $Si{a}_{2}BH$, followed by $H_2{O}_2,O{H}^{-}$
3. 1. $B{r}_2/C{H}_{2}C{l}_2$; 2. $Et{O}^{-}/EtOH$ 3. $NaN{H}_2/N{H}_3$, followed by $C{H}_{3}I$ 4. $Li,N{H}_3$
4. 1. $B{r}_2/C{H}_{2}C{l}_2$; 2. $EtOH$ 3. $NaN{H}_2/N{H}_3$, followed by $C{H}_{3}I$ 4. $Li,N{H}_3$

Q. Identify X in the given reaction.
$RMgX+R^{\prime }SH\stackrel{\text{Dry Ether}}{\to }X$

1. $RSH$
2. $RH$
3. $R^{\prime }H$
4. None of the above

Q. The correct decreasing order of stability of alkene formed from the following alkyl halides according to the $\beta -$ elimination reaction with alcoholic KOH will be:
(i)
(ii) $C{H}_3-C{H}_2-Br$
(iii) $C{H}_3-C{H}_2-C{H}_2-Br$

1. (i) > (ii) > (iii)
2. (iii) > (ii) > (i)
3. (ii) > (iii) > (i)
4. (i) > (iii) > (ii)

Q. For a general chemical change, $2A+3B\to$ products, the rate of disappearance of A is $r_1$ and of B is $r_2$. The rate $r_1$ and $r_2$ are related as :-

1. $3r_1=2r_2$
2. $r_1=r_2$
3. $2r_1=3r_2$
4. $r_1^2=2r_2^2$

Q. Find out $P$ in the given reaction sequence:

1. 
2. 
3. 
4. 

Q. The final product $D$ in the given sequence of reactions is:

1. Benzene
2. Tetralin
3. Decalin
4. Naphthalene

Q.

1. none of these

2. CH₃-CH₃

3. CH₂=CH₂

4. CH₃-CH₂= CH₂

Q. 1, 2-Dibromoethane on treatment with X moles of $NaN{H}_2$ followed by treatment with $C_2{H}_{5}Br$ gives a butyne. The value of X is: