Which is more acidic, acetylene or ethene? pKa of acetylene is $25,$ while that of ethene is $44.$ HC$=$CH vs H$2$C$=$CH$2$acetylene etheneGroup of answer choicesThe conjugate base of acetylene is more stable because of the sp$3$ hybridization in the sigma bond. is more stable so it's more acidic.The hybridization of the C in acetylene is sp while the carbons in ethene are sp$2.$ The orbital in acetylene has more s character, which causes it to be closer to the nucleus. This stabilizes the conjugate base of acetylene more.The hybridization of the C in acetylene is sp$2$ while the carbons in ethene are sp$.$ The orbital in acetylene has more p character, which causes it to be closer to the nucleus.