Integer Answer Type Questions for JEE: Hydrocarbons | Chapter-wise Tests for JEE Main & Advanced PDF Download

Q.1. (CH₃)3CBr

Ans. 2

Compound (C) has one chiral C-atom. Therefore, it has two stereoisomers.

Q.2. An organic compound (A) contains only C, H and O atoms. On reaction with excess of CH3MgI, one mole of (A) gives a gas (X) whose volume under STP conditions was found to be 67.2 litre. The number of hydroxyl groups in the compound (A) are

Ans. 3

67.2/22.4 = mole of gas(X) evolved = 3 mole of gas(X)
The number of active H-atom present in a molecule is equal to the number of moles of gas obtained i.e. no. of - OH groups in compound (A) = 3.

Q.3. The number of possible enantiomeric pairs that can be produced during monochlorination of 2-methylbutane is

Ans. 2

Thus, 2 pair of enantiomers are formed.

Q.4. Isopentane can form four monobromo isomeric derivatives. How many of them are optically active?

Ans. 2

Q.5. The treatment of CH₃OH with CH₃MgI release 1.04 mL of a gas at STP. The mass of CH₃OH added is

Ans. 1.49

1.49 mg

Q.6. The enthalpy of combustion of cyclohexane, cyclohexene and H₂ are respectively –3920, –3800 and –241 kJ mol–1. The heat of hydrogenation of cyclohexene is

Ans. –121
C₆H₁₂ + 9O_{2 →} 6CO₂ + 6H₂O …(i)
2C₆H₁₂ + 17O_{2 →}  12CO₂ + 10H₂O …(ii)
H₂ + ½O₂ → H₂O …(iii)
To arrive this equation
C₆H₁₀ + H2 → C₆O₁₂ …(iv)
Adding equation (ii) and (iii) and then subtracting (i), we get  equation (iv)
(–3800 –241) – (–3920) kJ mol^–1
–4041 + 3920 = –121 kJ mol^–1

Q.7. The number of possible enantiomeric pairs that can be produced during monochlorination of 2-methyl butane is

Ans. 2
gives two pairs of enantiomersand

Q.8. The number of monochloro derivatives that the compound 'D' can give

Ans. 2

CH₃ — CH₃ — CH₂ — CH₂ — Cl

Q.9. Find the number of p bond in the final product of following reaction.

Ans. 1

Q.10. 

Mono halo substitution Product(s) total no. of possible enantiomeric pairs will form are

Ans. 2

Only two products contain chiral carbon atom.  Hence no. of possible enantiomeric pairs are 2.