HYDROCARBONS QUIZ-16
Dear Readers,
The one subject in NEET which is candidates who can easily attain good marks is Chemistry. That's the reason, often, one doesn’t pay notice and choose to compromise it. But if one wants to rank above others, the tip is to be thorough with NEET chemistry concepts. The understanding of reactions and definite basic understanding is what requires major attention in Chemistry but once done it only gets simpler from there. The main focus on the to-do list should be on getting a hang of the NCERT syllabus of NEET chemistry..
Q1. CH3CH=CHCHO is oxidized to CH3CH=CHCOOH using:
Solution
(b) A characteristic reaction of aldehyde with Tollen’s reagent. Rest all also attacks C=C.
(b) A characteristic reaction of aldehyde with Tollen’s reagent. Rest all also attacks C=C.
Q2.R—COOH⟶RCH2OH. This mode of reduction can be effected only by:
Solution
(d) Na/C2H5OH,LiAlH4 or NaBH4 are used for this purpose.
(d) Na/C2H5OH,LiAlH4 or NaBH4 are used for this purpose.
Q3.Alkyne, C7H12, when reacted with alkaline KMnO4 followed by acidification with HCl gives a mixture of (CH3)2CHCOOH+CH3CH2COOH,The alkyne C7H12 is
Solution
(c)
(c)
Q4. The relationship between acetylene and benzene is comparable to the relationship between propyne and
Solution
(d) Benzene is obtained by the polymerisation of acetylene,. Similarly, mesitylene is obtained by the polymerisation of propyne.
(d) Benzene is obtained by the polymerisation of acetylene,. Similarly, mesitylene is obtained by the polymerisation of propyne.
Q5. Octane number is:
Solution
(d) Octane number is a measure of quality of fuel.
(d) Octane number is a measure of quality of fuel.
Q6. A mixture of nitrogen and acetylene, on passing electric spark through it gives:
Solution
(b). CH≡CH+N2→2HCN
(b). CH≡CH+N2→2HCN
Q7. Correct statement about 1,3-dibutene
Solution
(d). CH2=CH-CH=CH2 (1,3-dibutene) is a conjugate diene because it has alternate carbon-carbon single and double bonds. It reacts with HBr. It also polymerises to form Buna-N rubber etc. It also polymerises to form SBr.
(d). CH2=CH-CH=CH2 (1,3-dibutene) is a conjugate diene because it has alternate carbon-carbon single and double bonds. It reacts with HBr. It also polymerises to form Buna-N rubber etc. It also polymerises to form SBr.
Q8. In which of the following will Kharasch effect operate?
Solution
(b). Unsymmetric alkene and HBr are primary conditions for Kharasch effect.
(b). Unsymmetric alkene and HBr are primary conditions for Kharasch effect.
Q9. In the reactions, 
A and B are geometrical isomers. Then,
A and B are geometrical isomers. Then,
Solution
(b)
(b)
Q10. In the series, ethane, ethene and ethyne, the C-H bond energy is
Solution
(d). C-H bond energy is greatest in ethyne due to the presence of triple bond.
(d). C-H bond energy is greatest in ethyne due to the presence of triple bond.
