171. Which of the following alkynes is most acidic?
A
$$C{H_3}C \equiv CH$$
B
$$C{H_3}C \equiv CC{H_3}$$
C
$$C{H_3}C{H_2}C \equiv CH$$
D
$$CH \equiv CH$$
Answer :
$$CH \equiv CH$$
172.
The major product formed in the reaction is :
\[\xrightarrow[\text{(mononitration)}]{Conc.\,HN{{O}_{3}}/conc.\,{{H}_{2}}S{{O}_{4}}}\]
A
B
C
D
Answer :
because of steric factor para is major.
173.
Observe the following reactions and predict the products $$A$$ and $$B.$$
A
B
C
D
Answer :
174.
In which step of the following reaction, $$s{p^3}$$ carbon changes to $$s{p^2}$$ carbon ?
A
Step 1
B
Step 2
C
Both
D
None
Answer :
Step 2
175. The gas liberated by the electrolysis of dipotassium succinate solution is :
A
Ethane
B
Ethyne
C
Ethene
D
Propene
Answer :
Ethene
176. When 3,3-dimethyl-2-butanol is heated with $$conc.\,{H_2}S{O_4},$$ the major product obtained is
A
2, 3-dimethyl-2-butene
B
3, 3-dimethyl-2-butene
C
2, 3-dimethyl-1-butene
D
$$cis$$ and $$trans$$ -isomers of 2, 3-dimethyl-2- butene
Answer :
2, 3-dimethyl-2-butene
177. Which of the following products is formed when $$n$$ - heptane is passed over $$\left( {A{l_2}{O_3} + C{r_2}{O_3}} \right)$$ catalyst at $$773\,K?$$
A
Benzene
B
Toluene
C
Polyheptane
D
Cycloheptane
Answer :
Toluene
$$ + 3{H_2}$$ 178. 1, 2-Benzpyrene is
A
a polynuclear hydrocarbon
B
carcinogenic in nature
C
an aromatic hydrocarbon
D
both (A) and (B)
Answer :
both (A) and (B)
179. The hydration of propyne results in formation of
A
Acetone
B
Propanol-1
C
Propene
D
Propanal
Answer :
Acetone
180. When 1-butyne undergoes oxymercuration with the help of $$HgS{O_4} + {H_2}S{O_4},$$ the product$$(s)$$ formed is/are
A
$$C{H_3}C{H_2}COOH + HCOOH$$
B
$$C{H_3}C{H_2}COC{H_3}$$
C
$$C{H_3}C{H_2}C{H_2}COOH$$
D
$$C{H_3}C{H_2}C{H_2}CHO$$
Answer :
$$C{H_3}C{H_2}COC{H_3}$$
