2025 · Q97
Which of the following statements relating to carbon and its compounds are correct?
- 11-Propyne has three double bonds.
- 2The boiling point of acetic acid is higher than methane.
- 3Ethanol reacts with sodium metal and produces hydrogen gas.
- 4Esters give effervescence on reaction with sodium bicarbonate. Select the answer using the code given below.
general-sciencechemistry
- A1 and 3
- B2 and 3 only
- C1 and 2
- D2, 3 and 4
Explanation
1-Propyne (CH3CCH) contains one triple bond, not three double bonds, so statement 1 is incorrect. Acetic acid boils at about 118 deg C, far above methane's -161 deg C, so statement 2 is correct. Ethanol reacts with sodium to liberate hydrogen gas, so statement 3 is correct. Effervescence with sodium bicarbonate is given by carboxylic acids, not esters, so statement 4 is incorrect. Hence 2 and 3 only are correct.